#include <stdio.h>
int main(){
    //input
    char S[1024+1];
    scanf("%s",S);

    //recover S
    for (int i = 0;i < 1025;i++){
        if (S[i] != '\0'){
            int aAlfIndex = S[i]-65;
            int bAlfIndex = (26*100-(i+1)+aAlfIndex)%26;
            S[i] = bAlfIndex+65;
        }else{
            break;
        }
    }

    //output
    printf("%s\n",S);

    return 0;
}