题解 | #删除字符串中出现次数最少的字符#

s = input()
w = ''
count = 999

for i in s:
    str_count = s.count(i)
    if str_count < count:
        count = str_count
        l = []
        l.append(i)
    elif str_count == count:
        l.append(i)

for i in s:
    for j in set(l):
        if i == j:
            break
    else:
        w+=i

if __name__ == "__main__":
    print(w)