#include <bits/stdc++.h>
using namespace std;
const long long int mod = 1e9 + 7;
const long long int MAX = 2e5 + 5;
const long long int N = 3e5;
long long int a[N];
void show(long long int a[], long long int array_size) {
  for (long long int i = 0; i < array_size; ++i) cout << a[i] << " ";
  cout << "\n";
}
void solve() {
  long long int n;
  cin >> n;
  string s;
  cin >> s;
  string re = "abcd";
  long long int c = 4;
  for (long long int i = 0; i < n; i++) {
    cout << re[c % 4];
    c++;
  }
}
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long int t = 1;
  while (t--) {
    solve();
  }
  return 0;
}
