#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define fore(i, a) for(auto &i:a)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
#define yes "YES"
#define no "NO"
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;

int main() {
    fastcin;
    int n;
    cin >> n;
    char c = 'a';
    int x;
    rep(i, 0, n) {
        string s = "a";
        rep(j, 0, 4) {
            s += c + i%26;
            x = i/26;
            s += c + x % 26;
            x /= 26;
            s += c + x % 26;
            x /= 26;
            s += c + x % 26;
        }
        if(i!=n-1) s+="a";
        else s+="n";
        print(s);
    }
    return 0;
}