#include <stdio.h>
#define LENGTH 1024

int main(void) {
    char s[LENGTH + 2], c;
    int i = 0, j;
    while ((c = getchar()) != EOF) {
        s[i] = c;
        i++;
    }
    for (j = 0; j < i; j++) {
        //printf("%c", s[j] - ((j % 26) + 1));
        //printf("%d\n", s[j]);
        s[j] = s[j] - 64 - (j + 1);
        //printf("%d\n", s[j]);
        while(s[j] < 1) {
            s[j] += 26;
        }
        s[j] += 64;
        printf("%c", s[j]);
    }
    printf("\n");


    return 0;
}