#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000

string change(int a) {
	string str;
	while (a > 0) {
		str.push_back('a' + a % 10);
		a /= 10;
	}
	return str;
}

int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int n; cin >> n;
	int tmp = 0;
	rep(i, n - 1) {
		cout << "a" << change(i) << "a" << endl;
	}
	cout << "asofjsdafiafozjfn" << endl;

    return 0;
}