import java.util.*;
import java.lang.*;
import java.io.*;
public class Main {
public static void main
(String[] args
) { try{
char fr[] = new char[26] ;
while((line = reader.readLine()) != null){
for(int i = 0 ; i < line.length() ; i++){
for(int j = i + 1 ; j < line.length() ; j++ ){
if( line.charAt(i) == line.charAt(j) ){
fr[i] = line.charAt(i) ;
}else{
fr[i] = fr[i + 1] ;
}
}
}
}
e.printStackTrace();
}
}
}
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