#include <bits/stdc++.h>
using namespace std;
int C[50][50];
int main() {
  C[0][0] = 1;
  for (int i = 1; i <= 30; i++) {
    C[i][0] = C[i][i] = 1;
    for (int j = 1; j <= 30; j++) {
      C[i][j] = C[i - 1][j] + C[i - 1][j - 1];
    }
  }
  string p = "aaaaaaaaab";
  int pSize = (int)p.size() - 1;
  string result = "";
  int n;
  cin >> n;
  for (int i = 30; i >= 9; i--) {
    while (n >= C[i][pSize]) {
      n -= C[i][pSize];
      result += 'b';
    }
    result += 'a';
  }
  reverse(result.begin(), result.end());
  result = p.substr(0, pSize - 1) + result;
  long long cnt = 0;
  int aCnt = 0;
  for (int i = 0; i < result.size(); i++) {
    aCnt += result[i] == 'a';
    if (result[i] == 'b') cnt += C[aCnt][pSize];
  }
  cout << result << " " << p << "\n";
  return 0;
}
