/* package whatever; // don't place package name! */
import java.util.*;
class Main{
public static void main
(String[] args
){ Scanner sc
= new Scanner
(System.
in); int i = 0; int j = s.length()-1;
while(i < j){
if(s.charAt(i) != s.charAt(j)){
return;
}
i++;j--;
}
}
}
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