#include<iostream>
#include<cstdio>
using namespace std;

int main() {
	char str[1025];
	scanf("%s", str);

	int i = 0;
	while (str[i] != '\0')
	{
		str[i] -= ((i+1) % 26);
		if (str[i] < 'A')
		{
			str[i] += 26;
		}
		i++;
	}
	printf("%s\n", str);

	return 0;
}