/*  Rot13.c  */
/*  Simple substitution cipher, in effect, rotates letters 13 places mod 26 */
/*  Uses stdin and stdout, useful in redirection  */
/*  http://www.infonexus.com/~daemon9/daemon9plan  */

#include <stdio.h>

int main(){
        int c;

        while((c=getchar())!=EOF){
                if(c>='a'&&c<='m')c=c+13;
                else if(c>='n'&&c<='z')c=c-13;
                else if(c>='A'&&c<='M')c=c+13;
                else if(c>='N'&&c<='Z')c=c-13;
                putchar(c);
        }
        return 0;
}