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

int
main(int argc, char *argv[]) {
	char alphabet_column_index[26 + 1] = {0}, column_index[3 + 1] = {0};
	for (char alphabet_index = 'A'; alphabet_index <= 'Z'; alphabet_column_index[alphabet_index - 'A'] = alphabet_index, alphabet_index++);
	int index = 26, length_alphabet_column_index = 0;

	while (index >= 0) {
		column_index[length_alphabet_column_index] = index % 26 + 'A' - 1;
		index /= 26;
		length_alphabet_column_index += 1;
	}

	printf("%s\n", column_index);
	return 0;
}