题解 | #字符统计#

import sys

for line in sys.stdin:
    dic: dict = {}
    for x in line.strip("\n"):
        if x not in dic.keys():
            dic[x] = 1
        else:
            dic[x] += 1
    # print(dic)
    print("".join(str(x[0]) for x in sorted(dic.items(), key=lambda x: (-x[1], x[0]))))