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 str = await readline();
    let key = await readline();
    let lowerStr = String(str).toLocaleLowerCase();
    let lowerKey = String(key).toLocaleLowerCase();
    let arr = lowerStr.split(lowerKey);
    console.log(arr.length - 1);
}()