//No.18 うーさー暗号
#include<iostream>
#include<complex>
#include<string>
using namespace std;

int main()
{
    string S;
    cin>>S;
    for(int i=0;i<S.length();i++){
        S[i] = S[i]-((i+1)%26);
        if((S[i]-'A')<0)S[i]='Z'+1-abs(S[i]-'A');
    }
    cout<<S<<endl;
    return 0;
}