#include <iostream>
using namespace std;

int main(void){
    int size= 1024;
    char* Array = new char [size];
    cin >> Array;

    for(int i=0; Array[i]!='\0'; i++){
        Array[i] -= (i+1)%26;
        if(Array[i]<65){
            Array[i]+=26;            
        }
    }
    printf("%s", Array);
    
    delete[] Array;
    return 0;
}