#include<stdio.h>
#include<string.h>

int main(void)
{
	int i, len;
	char mo[1026];

	fgets(mo, 1026, stdin);
	len = strlen(mo);
	for (i = 0; i < len; i++) {//len回
		mo[i] = mo[i] + 26 - (i+1) % 26;
		if(mo[i]>'Z')
		{
			mo[i] = mo[i] -26;
		}
	}
	mo[len-1] = '\0';
	printf("%s\n",mo);

	return 0;
}