#include <iostream>
#include <cstdio>
#include <cstring>

using namespace std;

string a = "", b = "";

int main() {
    int n;
    cin >> n;
    ios_base::sync_with_stdio(0);
    for (int i = 0; i < n; i++)
        a += "a";
    for (int i = 0; i < n; i++)
        b += "b";
    cout << a << endl << b << endl;
    return 0;
}