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

#define ll long long
#define all(x) x.begin(), x.end()
#define pb push_back
#define f first
#define s second

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    if (fopen("input.in", "r")) {
        freopen("input.in", "r", stdin);
        freopen("output.out", "w", stdout);
    }
    int n; 
    cin>>n;
    vector<int> a = {0,0,0,0,0,0,0,0};
    vector<int> b = {0,0};
    vector<string> res;
    int la = 0;
    int lb = 0;
    int flg = 0;
    int cnt = 206;
    int tcnt = 206;

    for(int i=0; i<n; i++) {
        string ts = "";
        for(int i=0; i<8; i++){
            cout<<(char)('a'+a[i]);
            // ts += ('a'+a[i]);
        }
        for(int i=0; i<2; i++){
            cout<<(char)('a'+b[i]);
            // ts += ('a'+b[i]);
        }
        // res.pb(ts);
        // for(int j=0; j+1<i; j++) {
        //     int dif = 0;
        //     for(int l=0; l<10; l++) if(res[j][l] != ts[l]) dif++;
        //     if(dif <= 1) {
        //         cout<<res[j]<<" "<<ts<<"\n";
        //     }
        // }
        cout<<"\n";
        if(tcnt == 0 && flg < 2) {
            b[lb]++;
            b[lb] %= 26;
            lb++;
            lb %= 2;
            flg++;
        } 
        else {
            if(flg == 2) {
                cnt--;
                tcnt = cnt;
                flg = 0;
                la = 0;
            }
            a[la]++;
            a[la] %= 26;
            la++;
            la %= 8;
            tcnt--;
        }
    }
}