题解 | #删除字符串中出现次数最少的字符#

import sys


def run(str):
    c_statistics = dict()
    l_str = list(str)
    c_smalllest = []
    result = []
# 有哪些字符
    clean_str = set(str)
# 统计每个字符的个数
    for c in clean_str:
        c_statistics[c] = l_str.count(c)
# 计算哪些字符最小
    l_count = c_statistics.values()
    smallest = min(l_count)
    for k, v in c_statistics.items():
        if v == smallest:
            c_smalllest.append(k)
# 循环去除最小字符
    for c in  l_str:
        if c not in c_smalllest:
            result.append(c)
    return ''.join(result)


if __name__== '__main__':
    str = sys.stdin.readline().strip()
    r = run(str)
    print(r)