#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#define INF 1000000000;

int main(void){
	char s[1025];
	scanf("%s",s);
	int i=0;
	while(s[i]!='\0'){
		if(s[i]-i%26-1>='A'){
			s[i]=s[i]-i%26-1;
		}else{
			s[i]=s[i]-i%26+25;
		}
		i++;
	}
	printf("%s\n",s);
	return 0;
}