Python题解 | #字符统计#

import sys
from collections import Counter

while True:
    try:
        s = input()
        arr = Counter(s)
        dict1 = sorted(arr.items(), key=lambda x: x[0], reverse=False)
        dict1 = sorted(dict1, key=lambda x: x[1], reverse=True)
        
        for i in dict1:
            print(i[0], end='')


    except:
        break