#include <bits/stdc++.h>
using namespace std;
long long power(long long x, long long y) {
  long long r = 1, z = x;
  while (y) {
    if (y & 1) r *= z;
    z *= z;
    y = y >> 1;
  }
  return r;
}
long long powerm(long long x, long long y, long long p) {
  long long r = 1;
  while (y) {
    if (y & 1) r = (r * x) % p;
    y = y >> 1;
    x = (x * x) % p;
  }
  return r % p;
}
long long modinv(long long x, long long m) { return powerm(x, m - 2, m); }
long long logarithm(long long a, long long b) {
  long long x = 0;
  while (a > 1) {
    x++;
    a /= b;
  }
  return x;
}
long long max3(long long a, long long b, long long c) {
  return max(a, max(b, c));
}
long long min3(long long a, long long b, long long c) {
  return min(a, min(b, c));
}
void under_rated() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
}
int32_t main() {
  under_rated();
  long long n;
  cin >> n;
  for (long long i = 0; i < n; ++i) {
    if (i % 4 == 0) {
      cout << "a";
    } else if (i % 4 == 1) {
      cout << "b";
    } else if (i % 4 == 2) {
      cout << "c";
    } else {
      cout << "d";
    }
  }
  cout << '\n';
  return 0;
}
