题解 | #删除字符串中出现次数最少的字符#

import sys


"""
输入
创建字典；字典的键值对，字母：出现的次数
找出值中的最小值，把最小值的键值对删除

"""
s = input()
dic = {}

# set 底层用的哈希表，容易直接排序改变数组原本的顺序
# ss = set(s) 
# for key in ss:
#     value = s.count(key)
#     dic[key] = value

for i in s:
    if i in dic.keys():
        dic[i] = dic[i] + 1
    else:
        dic[i] = 1

# 最小值
min_value = min(dic.values())

# 最小值对应的key
min_key = []
for key, value in dic.items():
    if value == min_value:
        min_key.append(key)

# 判断是否在最小值key组里面，在的话就跳过，不在就直接输出
for i in s:
    if i in min_key:
        pass
    else:
        print(i,end="")