#include <bits/stdc++.h>
using namespace std;
template <class T>
ostream& operator<<(ostream& stream, const vector<T> v) {
  stream << "[ ";
  for (int i = 0; i < (int)v.size(); i++) stream << v[i] << " ";
  stream << "]";
  return stream;
}
long long fpow(long long x, long long p, long long m) {
  long long r = 1;
  for (; p; p >>= 1) {
    if (p & 1) r = r * x % m;
    x = x * x % m;
  }
  return r;
}
long long inv(long long a, long long b) {
  return a < 2 ? a : ((a - inv(b % a, a)) * b + 1) / a % b;
}
int gcd(int a, int b) {
  if (!b) return a;
  return gcd(b, a % b);
}
long long gcd(long long a, long long b) {
  if (!b) return a;
  return gcd(b, a % b);
}
pair<string, string> get(int n, int k) {
  if (n == 0)
    return {"", ""};
  else if (n == 1)
    return {string(1, 'a' + k), string(1, 'a' + k)};
  else if (n == 2)
    return {string(2, 'a' + k), string(1, 'a' + k)};
  pair<string, string> r;
  int p = 0;
  if (n % 2 == 0) {
    r = get((n - 2) / 2, k + 1);
    p = 2;
  } else {
    r = get((n - 1) / 2, k + 1);
    p = 1;
  }
  int l = r.second.length();
  r.first.insert(l, p, 'a' + k);
  r.first += 'a' + k;
  r.first += 'a' + k;
  r.second += 'a' + k;
  return r;
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  pair<string, string> r = get(n, 0);
  cout << r.first << " " << r.second << "\n";
  return 0;
}
