题解 | #字符统计#

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

void async function () {
    const str = await readline();
    const map = new Map();
    for(const c of str){
        map.set(c,(map.get(c)||0)+1);
    }
    let arr = [...map.entries()];
    // console.log(arr)
    arr.sort((a,b)=>(a[1]===b[1]?a[0]>b[0]?1:-1:b[1]-a[1]));
    console.log(arr.map(item=>item[0]).join(""));
}()