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

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

	*index = 0;

	for (needle = &column_index[strlen(column_index) - 1];
	     needle >= column_index; needle--) {
		*index *= 'Z' - 'A';
		*index += *needle - 'A' + 1;
	}

	*index += 1;

	return 0;
}

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

	// 仕様で XFD が最大の列と定められている。
	bzero(column_index, sizeof(column_index));

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

	switch (strlen(column_index)) {
	case 1: break;
	case 2:
		carry = column_index[1];
		column_index[0] = column_index[1];
		column_index[1] = carry;
		break;
	}
}

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;
}