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

int
scan_column_index(char column_index[3 + 1], int *index) {
	const char *needle;

	*index = 0;

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

int
sprint_column_index(char column_index[3 + 1], int index) {
	char *needle;

	for (needle = &column_index[0]; index > 0; needle++, index /= 'Z' - 'A' + 2) {
		*needle = 'A' + (index % ('Z' - 'A' + 1));
	}

	*needle = '\0';
}

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

	strcpy(column_index, "A");

	for (int index = 0; index <= 128; index++) {
		scan_column_index(column_index, &position);
		position += 1;
		sprint_column_index(column_index, position);
		printf("[%s] %d\n", column_index, position);
	}
	
	return 0;
}