#pragma GCC optimize("O3")
#include <iostream>
using namespace std;
#include <vector>
#define pb push_back
template<class C> using vc=vector<C>;
#include <map>
#include <random>
#define For(i,a,b) for(int i=(a);i<(b);i++)
#define smax(a,b) a=max(a,b)
#define f first
#define s second
typedef pair<int,int> pi;

string a[5000];
int main()
{
    cin.sync_with_stdio(0), cin.tie(0), cout.sync_with_stdio(0), cout.tie(0);
    int n; cin>>n, a[0]="aaaaaaaaaa"; mt19937 rng(0);
    For(i,1,n) while(1)
    {
        int d=rng()%10; char c='a'+rng()%26;
        string b=a[i-1]; b[d]=c;
        bool bad=0;
        For(j,0,i-1)
        {
            int dif=0;
            For(k,0,10) if(b[k]!=a[j][k]) {dif++; if(dif==2) break;}
            if(dif==1) {bad=1; break;}
        }
        if(!bad) {a[i]=b; break;}
    }
    For(i,0,n) cout<<a[i]<<'\n';
}