#include <stdio.h>

#define ALP ('Z' - 'A' + 1)

int main(void)
{
	char s[1025];
	short i;
	scanf("%s",s);

	for (i=0;i<1025;i++) {
		if (s[i]=='\0') break;
		s[i] -= (i + 1) % ALP;
		if (s[i] < 'A') s[i] += ALP;
	}

	printf("%s\n",s);
	return 0;
}