#include <bits/stdc++.h>
// #include <boost/multi_array.hpp>
// #include <boost/optional.hpp>
// #include <boost/range/irange.hpp>
// #include <boost/range/algorithm.hpp>
// #include <boost/range/adaptors.hpp>
// #include <atcoder/all>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using P = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vi>;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep2(i, x, n) for(int i = x; i < (n); i++)
#define all(n) begin(n), end(n)
const int INF = 1e9;
const long long llINF = 1LL << 60;

int dy[] = {0, 0, 1, -1};
int dx[] = {1, -1, 0, 0};

void Main() {
    string s;
    cin >> s;
    rep(i, s.size()) {
        s[i] -= (i + 1);
        while(!('A' <= s[i] && s[i] <= 'Z')) {
            s[i] += 26;
        }
    }
    cout << s << endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}