#include <iostream>
#include <algorithm>
#include <cmath>
#include <map>
#include <vector>
#include <queue>
#include <functional>
#include <string>
#include <stack>

using namespace std;
using ll = long long;
typedef unsigned long long ull;
typedef pair<ll, ll> P;
typedef pair<ll, pair<ll, ll>> PP;

const ll MOD = 1e9 + 7;
const ll MOD2 = 998244353;
const ll INF = 1 << 30;
const ll INF2 = 9e18;
const double INF3 = 9e14;
const int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 };
const int tx[8] = { -1,0,1,-1,1,-1,0,1 }, ty[8] = { -1,-1,-1,0,0,1,1,1 };
#define ALL(x) (x).begin(),(x).end()
#define pb push_back
#define fr first
#define sc second




int main(){
	int n;
	cin >> n;
	cout << 'a' << endl;
	if (n == 1)return 0;
	vector<int>v = { 1,2,3,4,5,6,7,8,9,10 };
	for (int i = 1;i < n;i++) {
		string t = "a";
		for (auto u : v) {
			t += char('a' + u);
		}
		if (i != n)cout << t + 'a' << endl;
		else cout << t + 'n' << endl;
		next_permutation(ALL(v));
	}
	return 0;
}