#define _CRT_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <iostream>
#include <string>
#include <algorithm>
#include <queue>
#include <functional> 
typedef unsigned long long ull;
typedef long long ll;
using namespace std;
typedef unsigned long long ull;
int main() {
	char S[1025];
	scanf("%s", S);
	for (int i = 0; S[i] != '\0'; i++) {
		int c = (int)(S[i]) - (i + 1);
		while (1) {
			if (c >= (int)('A')) {
				printf("%c", (char)(c));
				break;
			}
			else {
				c += 26;
			}
		}
	}
	printf("\n");
	return 0;
}