题解 | #删除字符串中出现次数最少的字符#

while True:
    try:
        dic ={}
        s = input()
        px = ''
        for i in s:
            if i not in dic.keys():
                dic[i] = 1
            else:
                dic[i] += 1

        for i in s:
            if dic[i] > min(dic.values()):
                px += i
        print(px)
    except:
        break