#include<cstdio>
using namespace std;
int main(){
    char str[1025];
    int i = 0;
    int numA = (int)'A';
    int numZ = (int)'Z';
    int num = numZ - numA + 1;
    int zure;
    scanf("%s",str);
    while(str[i] != '\0'){
        zure = (i + 1) % num;
        str[i] -= zure;
            while(str[i]<numA){
            str[i] += num;
        }
        i++;
    }
    printf("%s\n",str);
    return 0;
}