#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
	int n;
	cin>>n;
	int m=20;
	char ch='a';
	int i,j;
	char ch1=ch;
	for (i=0;i<n;i++){
		for (j=0;j<20;j++){
			if (j==0){
				cout<<ch1;
				continue;
			}
			int index=(i+j)%26;
			if (ch+index>'z'){
				ch='a';
			}
			cout<<char(ch+index);
			ch1=ch+index;
		}
		cout<<endl;
	}
	return 0;
}