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

int
main(int argc, char *argv[]) {
	// 728
	int index;
	const char *target_address = "AAZ", address[1 + 3];
	char *needle;

	for (needle = target_address, index = 0; *needle != '\0'; needle++) {
		index *= strlen(ALPHABET);
		index += 1 + strchr(ALPHABET, *needle) - ALPHABET;
	}

	printf("%s -> %d\n", target_address, index);

	for (needle = address; index > 0; index /= strlen(ALPHABET)) {
		*needle = 'A' + index % strlen(ALPHABET) - 1;
	}

	printf("%d -> %s\n", index, address);
}