#include<stdio.h>
#include<ctype.h>

int main(void)
{
	char buf[1024+2];
	int i;

	while(scanf("%[A-Z]\n", buf)==1)
	{
		for(i=0;isupper(buf[i]);i++)
		{
			buf[i]=(((buf[i]-'A')-(i+1))%26+26)%26+'A';
		}
		printf("%s\n", buf);
	}

	return 0;
}