题解 | #字符统计#

let str;
while ((str = readline())) {
  let obj = {};
  for (let i = 0; i < str.length; i++) {
    obj[str[i]] = (obj[str[i]] || 0) + 1;
  }
  let arr = Object.entries(obj);

  arr.sort((a, b) => {
    if (a[1] === b[1]) {
      return a[0].charCodeAt() - b[0].charCodeAt();
    } else {
      return b[1] - a[1];
    }
  });
  print(arr.reduce((pre, cur) => pre + cur[0], ""));
}