#include <bits/stdc++.h>
using namespace std;

mt19937 rng(32);

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	string s = string(10, 'a');
	vector<string> ans;
	ans.push_back(s);
	for(int i = 0; i < n - 1; i++){
		for(int k = 0; k < 10; k++){
			string t = s;
			int v = ((t[k] - 'a') + 1 + (rng() % 25)) % 26;
			t[k] = (char)('a' + v);
			int ok = 1;
			for(int j = 0; j < i; j++){
				int cnt = 0;
				for(int l = 0; l < 10; l++) if(ans[j][l] != t[l]) cnt++;
				if(cnt == 1){
					ok = 0;
					break;
				}
			}
			if(ok){
				ans.push_back(t);
				s = t;
				break;
			}	
		}
	}
	for(string x : ans) cout << x << '\n';
	return 0;
}