#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

string make(ll n, ll m){
  vector<ll> v(m);
  v[0] = 1;
  REP(i,1,m){
    v[i] = v[i-1] * 26;
  }

  vector<ll> w;
  for(int i=m-1; i>=0; i--){
    if(n >= v[i]){
      w.push_back(n / v[i]);
      n %= v[i];
    }else{
      w.push_back(0);
    }
  }

  string ret;
  rep(i,w.size()){
    ret += (char)('a' + w[i]);
  }

  return ret;
}


int main(){
  int n;
  cin >> n;

  rep(i,n){
    cout << "a" << make(i,10);
    if(i==n-1) cout << "n" << endl;
    else cout << "a" << endl;
  }
  
  return 0;
}