题解 | #截取字符串#

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

void async function () {
    // Write your code here
    let str = await readline();
    let len = await readline();

    console.log(str.slice(0, len));
}()