题解 | #删除字符串中出现次数最少的字符#

s = input().lower()
dic = {}
res = ''
for i in s:
    if i not in dic:
        dic[i] = 1
    else:
        dic[i] += 1
Min = min(dic.values())
for j in s:
    if dic[j] != Min:
        res += j

print(res)