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

int main(void){
	int i,l,b;
	char s[2048];
	scanf("%s",s);
	l = strlen(s);
	for(i = 0;i <= l;i++){
		b = (i+1)%26;
		if(s[i]-65 < b){s[i]+=26;}
		s[i]-=b;
	}
	printf("%s\n",s);
	return 0;
}