题解 | #计算某字符出现次数#

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 arr = []
    while(line = await readline()){
        arr.push(line.toLowerCase())
    }
    let first = arr[0]
    let second = arr[1]
    // 方法1
    // let firstArr = first.split('')
    // let newArr = firstArr.filter(item =>item === second)
    // console.log(newArr.length)
    
    // 方法2
    let newArr = first.split(second)
    console.log(newArr.length-1)
}()