#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <cstring>

typedef long long ll;
using namespace std;

#define mod 1000003
#define INF 1000000000
#define LLINF 2000000000000000000LL

#define SIZE 10000


int main(){
    string S,ans;
    
    cin >> S;
    
    for(int i=1;i<=S.size();i++){
        
        ans += (S[i-1]-'A'+2600-i)%26+'A';
        
    }
    
    cout << ans << endl;
    
    return 0;
}