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#!/usr/local/bin/node
//
// See ../README.md
//
//
// Run as: node ch-1.js < input-file
//
require ('readline')
. createInterface ({input: process . stdin})
. on ('line', line => {
line = line . replace (/^[-+]/, '') . trim ()
if (line . match (/[^0-9]/)) {
console . log ("not an integer")
}
else {
if (line . length % 2 == 0) {
console . log ("even number of digits")
}
else {
if (line . length < 3) {
console . log ("too short")
}
else {
console . log (line . substr ((line . length - 3) / 2, 3))
}
}
}
})
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