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

int main(){
	char s[1025];
	scanf("%s",s);
	int i;
	
	for(i=0;i<strlen(s);i++){
		if(s[i]-'A'<(i+1)%26){ 
			s[i]+=26-(i+1)%26;
		}else{
			s[i]-=(i+1)%26;
		}
	}
	printf("%s\n",s);
	
	return 0;
}