题解 | #删除字符串中出现次数最少的字符#

from collections import defaultdict
strs=input()
dic=defaultdict(int)
for i in strs:
    dic[i]+=1
dicso=sorted(dic.items(),key=lambda x: x[1])
# print(dicso)
min=dicso[0][1]
res=set()
ans=""
# 记录需要被删除的元素
for re in dicso:
    if re[1]==min:
        res.add(re[0])
    if re[1]>min:
        break
for i in strs:
    if i not in res:
        ans+=i
print(ans)