#include <bits/stdc++.h>
using namespace std;

int main()
{
int i;
int N;
char S[ 1200 ];
char C;

	cin >> S;
	N = strlen( S );
	for( i = 0; i < N; i++ )
	{
		C = S[ i ] - ( i + 1 ) % 26;
		if( C < 'A' )
			S[ i ] = C + 26;
		else
			S[ i ] = C;
	}

	cout << S << endl;

	return 0;
}