#include <bits/stdc++.h>
using namespace std;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
#endif
using ll = long long;
using ld = long double;
const ll INF = 1ll<<60;
const ld EPS = 1.0/1e9;
#define endl "\n"
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
#define del(x) sort(all(x)); x.erase(unique(all(x)),x.end());


const ll MOD=1000000007;


int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  string s; cin >> s;
  rep(i,0,s.size()){
    ll x=(s[i]-i-1-'A');
    while(x<0) x+=26;
    cout << char(x+'A');
  }
  cout << endl;
}