#!/usr/bin/env lua

--[[
Challenge 119

TASK #1 - Swap Nibbles
Submitted by: Mohammad S Anwar
You are given a positive integer $N.

Write a script to swap the two nibbles of the binary representation of the
given number and print the decimal number of the new binary representation.

A nibble is a four-bit aggregation, or half an octet.

To keep the task simple, we only allow integer less than or equal to 255.

Example
Input: $N = 101
Output: 86

Binary representation of decimal 101 is 1100101 or as 2 nibbles (0110)(0101).
The swapped nibbles would be (0101)(0110) same as decimal 86.

Input: $N = 18
Output: 33

Binary representation of decimal 18 is 10010 or as 2 nibbles (0001)(0010).
The swapped nibbles would be (0010)(0001) same as decimal 33.
--]]

n = tonumber(arg[1])
n = (((n // 16) % 16) + ((n % 16) * 16))
io.write(n, "\n")