#include <bits/stdc++.h>
#define MOD 1000000007

using namespace std;

typedef pair<int,int> P;
typedef pair<int,pair<int,int>> PP;
typedef long long LL;

const double EPS = 1e-8;
const int INF = 1e9;

int dy[] = {0,1,0,-1};
int dx[] = {1,0,-1,0};

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

// command shift d duplicate
// command ctrl up down
// command D
// command caps G → '' ""
// vector<vector<int>> a(N,vector<int>(M,-1));
//diff < (./a.out < input.txt) output.txt
// sort(v.begin(),v.end(),greater<int>());