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Concatenated string with uncommon characters in Python
• Difficulty Level : Easy
• Last Updated : 19 Nov, 2020

Two strings are given and you have to modify 1st string such that all the common characters of the 2nd string have to be removed and the uncommon characters of the 2nd string have to be concatenated with uncommon characters of the 1st string.

Examples:

```Input : S1 = "aacdb"
S2 = "gafd"
Output : "cbgf"

Input : S1 = "abcs";
S2 = "cxzca";
Output : "bsxz"
```

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

This problem has existing solution please refer Concatenated string with uncommon characters of two strings link. We can solve this problem quickly in Python using Set and List Comprehension. Approach is simple,

1. Convert both strings into set so that they could have only unique characters. Now take intersection of two sets to get common character both strings have.
2. Now separate out those characters in each string which are not common in both of them and concatenate the characters.

 `# Function to concatenated string with uncommon  ` `# characters of two strings  ` ` `  `def` `uncommonConcat(str1, str2):  ` ` `  `    ``# convert both strings into set  ` `    ``set1 ``=` `set``(str1)  ` `    ``set2 ``=` `set``(str2)  ` ` `  `    ``# take intersection of two sets to get list of  ` `    ``# common characters  ` `    ``common ``=` `list``(set1 & set2)  ` ` `  `    ``# separate out characters in each string  ` `    ``# which are not common in both strings  ` `    ``result ``=` `[ch ``for` `ch ``in` `str1 ``if` `ch ``not` `in` `common] ``+` `[ch ``for` `ch ``in` `str2 ``if` `ch ``not` `in` `common]  ` ` `  `    ``# join each character without space to get  ` `    ``# final string  ` `    ``print``( ''.join(result) ) ` ` `  `# Driver program  ` `if` `__name__ ``=``=` `"__main__"``:  ` `    ``str1 ``=` `'aacdb'` `    ``str2 ``=` `'gafd'` `    ``uncommonConcat(str1,str2)  `

Output:

```cbgf
```

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