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