#include <iostream>
#include <string>
#include <cassert>
using namespace std;
int main(){
  long long x; cin >> x;
  assert(1<=x && x<=1000000000);

  if(x==1){
    puts("a");
    return 0;
  }

  string ch  = "abc";
  string ans = "";

  long long k = 0;
  while((1LL<<k) <= x) k++;

  int i = 0;
  for(k-=2; k>=0; k--){
    ans += ch[i%3];

    if((x>>k)&1){
      i++;
      ans += ch[i%3];
    }
  }

  cout << string(ans.rbegin(), ans.rend()) << ans << endl;
  return 0;
}