#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<unordered_map>
#include<vector>
#include<numeric>
#include<cmath>
using namespace std;
#define ll long long
#define ge getchar 
#define pun putchar('\n')
#define pu putchar
#define puk putchar(' ')
#define pb push_back
typedef vector<int> vint;
const int nn=1e5+6;
int n,a[10],d[10],h=25;

int main(){
	scanf("%d",&n);
	//if(
	for(int i=0;i<=9;i+=2)d[i]=1;
	int w=0,t=2,e=0;
	for(int i=1;i<=n;i++){
		for(int j=0;j<=9;j++)pu(a[j]+'a');pun;
		if(e){
			a[t]++;
			t--;
			if(a[t]==h)t+=2;
			e=0;
			continue;
		}	
		for(int j=0;j<=1;j++)if(d[j]){
			int xa=a[j]+d[j];
			if(xa<0||xa>h){
				d[j]=-d[j];
				a[t]++;
				t++;
				e=1;
			}else{
				a[j]=xa;
				swap(d[j],d[j^1]);
				break;
			}
		}

	}
	


	return 0;
}