# Print reverse string after removing vowels

Given a string s, print reverse of string and remove the characters from the reversed string where there are vowels in the original string.

Examples:

```Input : geeksforgeeks
Output : segrfseg
Explanation :
Reversed string is skeegrofskeeg, removing characters
from indexes 1, 2, 6, 9 & 10 (0 based indexing),
we get segrfseg .

Input :duck
Output :kud
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

A simple solution is to first reverse the string, then traverse the reversed string and remove vowels.

An efficient solution is to do both tasks in one traversal.
Create an empty string r and traverse the original string s and assign the value to the string r. Check whether, at that index, the original string contains a consonant or not. If yes then print the element at that index from string r.

Basic implementation of the above approach :

## C++

 `// CPP Program for removing characters ` `// from reversed string where vowels are ` `// present in original string ` `#include ` `using` `namespace` `std; ` ` `  `// Function for replacing the string ` `void` `replaceOriginal(string s, ``int` `n) ` `{ ` `    ``// initialize a string of length n ` `    ``string r(n, ``' '``); ` ` `  `    ``// Traverse through all characters of string ` `    ``for` `(``int` `i = 0; i < n; i++) { ` ` `  `        ``// assign the value to string r ` `        ``// from last index of string s ` `        ``r[i] = s[n - 1 - i]; ` ` `  `        ``// if s[i] is a consonant then ` `        ``// print r[i] ` `        ``if` `(s[i] != ``'a'` `&& s[i] != ``'e'` `&& s[i] != ``'i'` `            ``&& s[i] != ``'o'` `&& s[i] != ``'u'``) { ` `            ``cout << r[i]; ` `        ``} ` `    ``} ` `    ``cout << endl; ` `} ` ` `  `// Driver function ` `int` `main() ` `{ ` `    ``string s = ``"geeksforgeeks"``; ` `    ``int` `n = s.length(); ` `    ``replaceOriginal(s, n); ` ` `  `    ``return` `0; ` `} `

## Java

 `// Java Program for removing characters ` `// from reversed string where vowels are ` `// present in original string ` `class` `GFG { ` ` `  `// Function for replacing the string ` `    ``static` `void` `replaceOriginal(String s, ``int` `n) { ` `        ``// initialize a string of length n ` `        ``char` `r[] = ``new` `char``[n]; ` ` `  `        ``// Traverse through all characters of string ` `        ``for` `(``int` `i = ``0``; i < n; i++) { ` ` `  `            ``// assign the value to string r ` `            ``// from last index of string s ` `            ``r[i] = s.charAt(n - ``1` `- i); ` ` `  `            ``// if s[i] is a consonant then ` `            ``// print r[i] ` `            ``if` `(s.charAt(i) != ``'a'` `&& s.charAt(i) != ``'e'` `&& s.charAt(i) != ``'i'` `                    ``&& s.charAt(i) != ``'o'` `&& s.charAt(i) != ``'u'``) { ` `                ``System.out.print(r[i]); ` `            ``} ` `        ``} ` `        ``System.out.println(``""``); ` `    ``} ` ` `  `// Driver function ` `    ``public` `static` `void` `main(String[] args) { ` `        ``String s = ``"geeksforgeeks"``; ` `        ``int` `n = s.length(); ` `        ``replaceOriginal(s, n); ` `    ``} ` `}  ` ` `  `// This code is contributed by princiRaj1992 `

## Python3

 `# Python3 Program for removing characters ` `# from reversed string where vowels are ` `# present in original string ` ` `  `# Function for replacing the string ` `def` `replaceOriginal(s, n): ` ` `  `    ``# initialize a string of length n ` `    ``r ``=` `[``' '``] ``*` `n ` ` `  `    ``# Traverse through all characters of string ` `    ``for` `i ``in` `range``(n): ` ` `  `        ``# assign the value to string r ` `        ``# from last index of string s ` `        ``r[i] ``=` `s[n ``-` `1` `-` `i] ` ` `  `        ``# if s[i] is a consonant then ` `        ``# print r[i] ` `        ``if` `(s[i] !``=` `'a'` `and` `s[i] !``=` `'e'` `and`  `            ``s[i] !``=` `'i'` `and` `s[i] !``=` `'o'` `and`  `            ``s[i] !``=` `'u'``): ` `            ``print``(r[i], end ``=` `"") ` `    ``print``() ` ` `  `# Driver Code ` `if` `__name__ ``=``=` `"__main__"``: ` `    ``s ``=` `"geeksforgeeks"` `    ``n ``=` `len``(s) ` `    ``replaceOriginal(s, n) ` ` `  `# This code is conributed by ` `# sanjeev2552 `

## C#

 `// C# Program for removing characters ` `// from reversed string where vowels are ` `// present in original string ` `using` `System; ` ` `  `class` `GFG ` `{ ` ` `  `    ``// Function for replacing the string ` `    ``static` `void` `replaceOriginal(String s, ``int` `n)  ` `    ``{ ` `        ``// initialize a string of length n ` `        ``char` `[]r = ``new` `char``[n]; ` ` `  `        ``// Traverse through all characters of string ` `        ``for` `(``int` `i = 0; i < n; i++)  ` `        ``{ ` ` `  `            ``// assign the value to string r ` `            ``// from last index of string s ` `            ``r[i] = s[n - 1 - i]; ` ` `  `            ``// if s[i] is a consonant then ` `            ``// print r[i] ` `            ``if` `(s[i] != ``'a'` `&& s[i] != ``'e'` `&& s[i] != ``'i'` `                    ``&& s[i] != ``'o'` `&& s[i] != ``'u'``) ` `            ``{ ` `                ``Console.Write(r[i]); ` `            ``} ` `        ``} ` `        ``Console.WriteLine(``""``); ` `    ``} ` ` `  `    ``// Driver code ` `    ``public` `static` `void` `Main(String[] args) ` `    ``{ ` `        ``String s = ``"geeksforgeeks"``; ` `        ``int` `n = s.Length; ` `        ``replaceOriginal(s, n); ` `    ``} ` `} ` ` `  `// This code is contributed by Rajput-JI `

Output:

```segrfseg
```

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