#include <stdio.h>

int main(void){
	int i;
	char S[1100];
	scanf("%s", S);
	
	for(i=0;i<1100;i++){
		int n = (i+1)%26;
		int data = S[i] - 'A';
		if(S[i] == '\0'){
			break;
		}
		data = (data + (26 - n))%26;
		
		S[i] = (char)(data + 'A');
	}
	
	printf("%s\n", S);
	return 0;
}