#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void)
{
	char s[21];
	int n, i, j;
	srand(0);
	scanf("%d", &n);
	for (i = 1; i < n; i++) {
		for (j = 0; j < 20; j++) s[j] = 'a' + rand()*('z' - 'a' + 1) / (1 + RAND_MAX);
		s[20] = '\0';
		puts(s);
	}
	printf("aaaaaaaaaaaaaaaaaaan\n");
	return 0;
}