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use fmt;
use bufio;
use os;
use shlex;
use strings;
use strconv;
use sort;
use sort::cmp;
use io;
export fn main() void = {
do(os::stdin);
};
fn do(h: io::handle) int = {
const sc = bufio::newscanner(h);
defer bufio::finish(&sc);
let l1: []int = [];
let l2: []int = [];
defer free(l1);
defer free(l2);
for (const line => bufio::scan_line(&sc)!) {
const tok = strings::tokenize(line, " ");
let isfirst = true;
for (const t => strings::next_token(&tok)) {
if (t == "") {
continue;
};
const x = strconv::stoi(t)!;
if (isfirst) {
append(l1, x);
isfirst = false;
} else {
append(l2, x);
};
};
};
sort::sort(l1, size(int), &cmp::ints);
sort::sort(l2, size(int), &cmp::ints);
let sum = 0;
for (let i = 0z; i < len(l1); i += 1) {
const l = l1[i];
const j = l2[i];
const diff = if (l > j) {
yield (l, j, l - j);
} else {
yield (j, l, j - l);
};
fmt::printfln("{} - {} = {}", diff.0, diff.1, diff.2)!;
sum += diff.2;
};
fmt::println(sum)!;
return sum;
};
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