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

int main(int argc, char *argv[]) {
	srandom(time(NULL));
	if (argc > 1) {
		char generated[atoi(argv[1])+1];
		int i;
		for (i=0; i<=atoi(argv[1]); i++) {
			char start = 'a';
			if (random()%2) {
				start = 'A';
			}
			generated[i] = start + random()%26;
		}
		generated[i] = '\0';
		printf("%s\n", generated);
	} else {
		fprintf(stderr, "Too few arguments.\n");
		return 1;
	}
	return 0;
}