#include <iostream>
#include <string>

char L[26];

void setAlphabet(void)
{
	int a = 65;

	for(int i = 0; i < 26; i ++)
	{
		L[i] = (char)(a + i);
	}
}

char getNextAlphabet(char A, int n) //A=65, Z=90
{
	int m = n;
	int l = (int)A - 65;
	
	for(;m >= 26;)
	{
		m = m - 26;
	}
	
	if(l - m < 0)
	{
		return L[26 + l - m];
	}
	else
	{
		return L[l - m];
	}
}

int main(void)
{
	setAlphabet();

	std::string S;

	std::cin >> S;
	
	int count = S.size();
	
	char alpha[count];
	
	for(int i = 0; i < count; i ++)
	{
		alpha[i] = S[i];
	}
	
	for(int i = 1; i <= count; i ++)
	{	
		std::cout << getNextAlphabet(alpha[i - 1], i);
	}
	
	std::cout << std::endl;

	return 0;
}