题解 | #删除字符串中出现次数最少的字符#

while True:
    try:
        a = input()
        b = dict()
        for i in a:
            if i not in b.keys():
                b[i] = 1
            else:
                b[i] = b[i] + 1
        s = ""
        for i in a:
            if b[i] != min(b.values()):
                s = s + i
            else:
                pass
        else:
            pass
        print(s)
    except:
        break