#include #include #include #include #include #include #include #include #include #include #include using namespace std; using namespace atcoder; typedef long long ll; #define rep(i,n) for (int i = 0; i < int(n);i++) using mint = modint1000000007; int main(){ string s; cin >> s; int n = s.size(); for (int i = 0; i< n;i++){ int diff = int(s[i]-'a'); diff += 26-i-1; diff %= 26; s[i] = char('a'+diff); } cout << s << endl; return 0; }