题解 | #截取字符串#

const rl = require("readline").createInterface({ input: process.stdin });
let arr=[]
rl.on("line",line=>{
    arr.push(line)
})
rl.on("close",()=>{
    let str=arr[0]
    let n=Number(arr[1])
    console.log(str.substring(0,n))
})