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

int
main(int argc, char *argv[]) {
	int alphabet_needle, index = 52, column_index_needle;
	char ALPHABET['Z' - 'A' + 2], reverse_column_index[3 + 1], column_index[3 + 1];

	for (alphabet_needle = 'A'; alphabet_needle <= 'Z'; alphabet_needle++) {
		ALPHABET[alphabet_needle - 'A'] = alphabet_needle;
	}

	ALPHABET['Z' - 'A' + 1] = '\0';
printf("[%s]\n", ALPHABET);
	
	for (column_index_needle = 0; index > 0; column_index_needle++) {
		reverse_column_index[column_index_needle] = ALPHABET[(index - 1) % ('Z' - 'A' + 1)];
		index = (index - 1) / ('Z' - 'A' + 1);
	}

	for (column_index_needle = 0; column_index_needle < strlen(reverse_column_index); column_index_needle++) {
		column_index[column_index_needle] = reverse_column_index[strlen(reverse_column_index) - column_index_needle - 1];
	}

	printf("%s\n", column_index);
}