#!/usr/bin/env cscript
#include <stdio.h>
#include <string.h>

int
main(int argc, char *argv[]) {
	int carry;
	char column_index[3 + 1], *needle;

	strcpy(column_index, "A");


	for (int i = 0; i <= 52; i++) {
		carry = 0;

		for (needle = &column_index[strlen(column_index) - 2];
		     *needle != 'Z' && needle >= column_index;
		     needle--) {
			if (carry) {
				carry = 0;
			}

			*needle =  'A';
			carry = 1;
		}
		*needle += 1;
		puts(column_index);
	}
}