题解 | #合法IP#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    const ip = await readline();
    const list = ip.split(".");
    console.log(list.length === 4 && list.every(item => String(parseInt(item)).length === item.length && parseInt(item) >= 0 && parseInt(item) <= 255)?"YES":"NO");
}()