#include <bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define REP(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define ALL(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
const int INF=1e9;
int main(){
      string s;
      cin>>s;
      REP(i,s.size()){
            int ii=i%26;
            s[i]=((s[i]-'A'-ii-1+26)%26)+'A';
      }
      cout<<s<<endl;
}