#include <bits/stdc++.h>
#include <algorithm>
using namespace std;
#define rep(i,n) for (ll i = 0; i < (n); i++)
#define repd(i,a,b) for (ll i = (a); i < (b); i++)
#define INF LLONG_MAX
#define mod 1000000007
typedef long long ll;

int main(void)
{
    int a;
    cin >> a;
	cout << aaa << endl;
	cout << aab << endl;
	cout << aba << endl;
	cout << abb << endl;
	return 0;
}
