题解 | #删除字符串中出现次数最少的字符#

while True:
    try:
        str1 = input()
        counter = {}
        res = ""
        for char in str1:
            if char not in counter:
                counter[char] = 1
            else:
                counter[char] += 1
        
        min_occer = min(counter.values())

        for char in str1:
            if counter[char] != min_occer:
                res += char
        
        print(res)

    except:
        break