#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

int main()
{
	enum ALPHABET
	{
		Alphabet=26,
	};

	int cnt = 0;
	int size = 'A';
	char str[1025] = "";
	scanf("%s", str);
	for (int i = 0;str[i] != '\0';i++)
	{
		cnt++;
		int minus = 0;
		if (cnt > Alphabet)
		{
			cnt -= Alphabet;
		}
		
		minus = cnt;
		str[i] -= minus;

		if (str[i] < size)
		{
			str[i] += Alphabet;
		}
	}

	printf("%s", str);

	return 0;
}