题解 | #字符统计#

import sys

for line in sys.stdin:
    data=line[:-1]
    counter={}
    for c in data:
        if c not in counter:
            counter[c]=1
        else:
            counter[c]+=1
            
    temp=list(counter.items())
    result=sorted(temp, key=lambda x : (x[1], -ord(x[0])), reverse=True)
    str_result=[]
    for c, _ in result:
        str_result.append(c)
    print(''.join(str_result))