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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 => {
let numbers = {}
let input = [... line . matchAll (/[1-9][0-9]*/g)] . map (_ => + _ [0])
input . forEach (n => {
if (!numbers [n]) {
numbers [n] = 1
}
else {
numbers [n] ++
}
})
for (let n in numbers) {
if (numbers [n] % 2 == 1) {
console . log (n)
}
}
})
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