#include<stdio.h>
#include<string.h>
int main(void){
	char c[1025];
	int i,l;
	scanf("%s",c);
	l = strlen(c);
	for(i=0;i<l;i++){
		c[i] -= i+1;
		while(c[i] < 'A'){
			c[i] += 'Z'-'A'+1;
		}
	}
	printf("%s\n",c);
	return 0;
}