#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;
	string S;
	for (i=0;i<n;i++){
		for (j=0;j<19;j++){
			if (j==0){
				S.push_back(ch1);
				if (i==n-1){
					S.push_back('n');
					break;
				}
				continue;
			}
			int index=(i+j)%26;
			if (ch+index>'z'){
				ch='a';
			}
			if (ch+index=='n'){
				index++;
			}
			S.push_back(char(ch+index));
			ch1=ch+index;
		}
		cout<<S<<endl;
		S.clear();
		if (ch1=='n'){
			return 0;
		}
	}
	return 0;
}