#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
const int INF = 0x3f3f3f3f, N = 2e5 + 5;
inline int read() {
  int sum = 0, f = 1;
  char c = getchar();
  while (c > '9' || c < '0') {
    if (c == '-') f = -f;
    c = getchar();
  }
  while (c >= '0' && c <= '9') sum = sum * 10 + c - 48, c = getchar();
  return sum * f;
}
string s, p;
int n;
void solve(int n, char c) {
  if (n <= 0)
    return;
  else if (n == 1) {
    s += c;
    p += c;
    return;
  } else if (n == 2) {
    s += c;
    s += c;
    p += c;
    return;
  } else {
    if (n & 1) {
      solve(n / 2, c + 1);
      s = p + c + s.substr(p.size(), s.size() - p.size() + 1) + c + c;
      p += c;
    } else {
      solve(n / 2 - 1, c + 1);
      s = p + c + c + s.substr(p.size(), s.size() - p.size() + 1) + c + c;
      p += c;
    }
  }
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  solve(n, 'a');
  cout << s << ' ' << p << '\n';
  return 0;
}
