const rl = require('readline').createInterface({ input: process.stdin })
var iter = rl[Symbol.asyncIterator]()
const readline = async () => (await iter.next()).value
// 用于存放输入的值
let lines = []
void (async function () {
while ((line = await readline())) {
// Write your code here
// 将输入的值放进数组中
lines.push(line)
// 如果输入的是两组数据
if (lines.length === 2) {
// 获取输入的字符串
let str = lines[0]
// 获取要截取的长度
let k = parseInt(lines[1])
console.log(str.slice(0, k))
}
}
})()
