#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int t, n, i, j, k, l, flag, flag1, count, count1, count2, count3,
      count4, sum, max1, max2, m, c1, c2, temp, suma, sumb;
  long long int d, e;
  long long int a[300001], b[1001][1001], a1[300001];
  vector<long long int> v1, v2, v;
  string s1, s2;
  long long int f[100001];
  for (i = 0; i < 100001; i++) f[i] = 0;
  count = 0, flag = 0, flag1 = 0, sum = 0, max1 = 0, max2 = 0, c1 = 0, c2 = 0,
  temp = 0, suma = 0, sumb = 0, count1 = 0, count2 = 0, count3 = 0, count4 = 0;
  long long int max3 = 0, max4 = 0, pro = 1, min1 = 999999999;
  cin >> n;
  for (i = 0; i < (n / 4); i++) cout << "abcd";
  if (n % 4 == 1)
    cout << "a";
  else if (n % 4 == 2)
    cout << "ab";
  else if (n % 4 == 3)
    cout << "abc";
  return 0;
}
