#include <iostream>
using namespace std;
int main() {
    const int N = 1024;
    int i=0, j;
    char a, s[N];
    a = getchar();
    while (a >= 65 && a <= 90) {
        s[i] = a;
        i++;
        a = getchar();
    }
    for (j=1; j<=i; j++) {
        s[j-1] = s[j-1] - j;
        if (s[j-1] < 65) s[j-1] += 26;
    }
    for (j=0; j<i; j++) {
        cout << s[j];
    }
    cout << endl;
    return 0;
}