#include <bits/stdc++.h>
using namespace std;
int main() {
  int num = 0;
  cin >> num;
  if (num >= 1) {
    cout << "a" << endl;
  }
  if (num >= 2) {
    cout << "ab" << endl;
  }
  if (num >= 3) {
    cout << "a" << endl;
  }
  if (num >= 4) {
    cout << "a" << endl;
  }
  if (num >= 5) {
    cout << "a" << endl;
  }
  if (num >= 6) {
    cout << "a" << endl;
  }
  if (num >= 7) {
    cout << "a" << endl;
  }
  if (num >= 8) {
    cout << "a" << endl;
  }
  if (num >= 9) {
    cout << "a" << endl;
  }
}
