#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;

#define PI         acos(-1.0)
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)

typedef long long ll;

int main(){
    string s;
    cin >> s;
    FOR(i,0,s.length()){
        int d = (s[i] - 'A') - (i + 1) + 26 * 1000;
        d = d % 26;
        s[i] = 'A' + d;
    }
    cout << s << endl;
    return 0;
}