#include <iostream>
#include <sstream>
#include <math.h>
#include <stack>
#include <set>
#include <algorithm>
#include <string>
#include <queue>
#include <stack>
#include <map>
#include <cstdio>
#include <vector>
using namespace std;

#define INF (1 << 30)
#define INFLL (1LL << 60)

char hukugen(char a,int n){
	a -= n;
	while(a < 65) {
		a += 26;
	}
	return a;
}

int main() {
	string str;
	cin >> str;
	for(int i = 0;i < str.size();i++){
		str[i] = hukugen(str[i],i + 1);
	}
	cout << str << endl;
	return 0;
}