import
java.util.*;
class
GFG
{
static
String getTime(String s,
int
n)
{
String res =
""
;
int
h = Integer.parseInt(s.substring(
0
,
0
+
2
));
int
m = Integer.parseInt(s.substring(
3
,
3
+
2
));
int
rev_h = (h %
10
) *
10
+
((h %
100
) - (h %
10
)) /
10
;
String rev_hs = Integer.toString(rev_h);
if
(h ==
23
&& m >=
32
)
{
res =
"-1"
;
}
else
if
(m < rev_h)
{
String temp =
""
;
if
(h <
10
)
temp =
"0"
;
temp = temp + Integer.toString(h);
if
(rev_h <
10
)
res = res + temp +
":0"
+ rev_hs;
else
res = res + temp +
":"
+ rev_hs;
}
else
{
h++;
rev_h = (h %
10
) *
10
+ ((h %
100
) -
(h %
10
)) /
10
;
rev_hs = Integer.toString(rev_h);
String temp =
""
;
if
(h <
10
)
temp =
"0"
;
temp = temp + Integer.toString(h);
if
(rev_h <
10
)
res = res + temp +
":0"
+ rev_hs;
else
res = res + temp +
":"
+ rev_hs;
}
return
res;
}
public
static
void
main(String[] args)
{
String s =
"21:12"
;
int
n = s.length();
System.out.println(getTime(s, n));
}
}