/// Brrrr Brrrr
#pragma GCC optimize("O3")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("avx,avx2,fma")

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

#define pb push_back
#define F first
#define S second
#define f(i, a, b)  for(int i = a; i < b; i++)
#define all(a)  a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define sz(x) (int)(x).size()
#define mp(x,y) make_pair(x,y)
#define popCnt(x) (__builtin_popcountll(x))
#define int ll

using ll = long long;
using ii = pair<int, int>;
using ull = unsigned long long;

const int N = 1e6+5, LG = 18, MOD = (119 << 23) + 1;
const long double PI = acos(-1);
const long double EPS = 1e-7;

const int dx[] = {0,0,1,-1};
const int dy[] = {1,-1,0,0};


void doWork() {
    mt19937 mrand(time(0));
    int n;
    cin >> n;

    vector<string> vs;
    vs.push_back(string(10, 'a'));

    f(i,1,n) {
        vs.push_back("");
        while(true) {
            vs[i] = vs[i-1];
            vs[i][mrand()%10] = 'a' +mrand()%26;
            bool ok = true;
            f(j,0,i-1) {
                int cnt = 0;
                f(k,0,10) cnt += vs[i][k]!=vs[j][k];
                if(cnt==1) {
                    ok=false;
                    break;
                }
            }
            if(ok) {
                break;
            }
        }
    }

    for(auto x : vs)
        cout << x << '\n';




}
int32_t main() {
#ifdef ONLINE_JUDGE
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif // ONLINE_JUDGE

    int t = 1;
//    cin >> t;
    while (t--) {
        doWork();
    }
    return 0;
}

///Look at my code ya codeomk