#!/usr/bin/env cscript
#include <stdio.h>
#include <string.h>
#define ALPHABET "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

void
increment_column(char *column_string) {
	char *needle;

	for (needle = &column_string[strlen(column_string) - 1];
	     column_string <= needle; needle--) {
		if (*needle == 'Z') {
			*needle = 'A';
			*(needle + 1) = 'A';
		} else {
			*needle += 1;
			return;
		}
	}
}

int
main(int argc, const char *argv[]) {
	char column_string[3 + 1];

	strcpy(column_string, "A");

	for (int n = 1; n <= 78; n++) {
		puts(column_string);
		increment_column(column_string);
	}

	return 0;
}