#include<iostream>
#include<vector>
#include<map>
#include<algorithm>
#include<math.h>
#include<string>
typedef long long ll;
typedef unsigned long long ull;
const ll LINF = 1e18;
const int INF = 1e8;

using namespace std;


//マクロ定義
#define vvint(vec,n,m,l) vector<vector<int>> vec(n, vector<int>(m,l));	// lで初期化
#define vvll(vec,n,m,l) vector<vector<ll>> vec(n,vector<ll>(m,l));
#define vint vector<int>
#define pint pair<int,int>
#define rep(i,a) for(int i=0;i<(a);i++)
#define all(x) (x).begin(),(x).end()		
#define debug system("pause")				//デバッグ用


int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	string s;

	cin >> s;

	int i = 0;

	for (int i = 0; i < s.size(); i++)
	{
		char c;
		if ((s[i] - 'A' - (i + 1)) % 26 > 0)
			c = 'A' + (s[i] - 'A' - (i + 1)) % 26;
		else
			c = 'Z' + 1 + (s[i] - 'A' - (i + 1)) % 26;
		cout << c;
	}

	cout << endl;

}