#include <bits/stdc++.h>
using namespace std;
// #include <boost/multiprecision/cpp_int.hpp>
// namespace mp = boost::multiprecision;
// #include <atcoder/all>
// using namespace atcoder;
// https://atcoder.github.io/ac-library/production/document_ja/
#pragma GCC optimize("O0")
typedef long long int ll;
typedef long double ld;
const ll mod = 1e9+7;
const ll INF = 9223372036854775806;
#define rep(i,n) for (ll i = 0; i < (n); ++i)
#define Rep(i,a,n) for (ll i = (a); i < (n); ++i)
#define All(a) (a).begin(),(a).end()
#define Pi acos(-1)
using Graph = vector<vector<ll>>;
using V = vector<ll>;
using P = pair<ll,ll>;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    cout << setprecision(15) << fixed;
  }
} iosetup;
void printvec(vector<ll> a) {
  for(ll i = 0; i < a.size(); i++) {
    cout << a[i] << ' ';
  }
  cout << '\n';
}
void printgrid(vector<vector<ll>> g) {
  for (ll i = 0; i < g.size(); i++) {
    printvec(g[i]);
  }
}

int main() {
  ll n;
  string s;
  cin >> n >> s;
  rep(i,n) {
    cout << char((25-s[i]+'a')%26 + 'a');
  }  
}