题解 | #删除字符串中出现次数最少的字符#

line = input().strip()
dict_line = dict()
for i in  line:
    if i not in dict_line.keys():
        dict_line[i] = 1
    else:
        dict_line[i] += 1
min_keys = sorted(dict_line.values())[0]
delet_list = []
new_str = []
for _k,_v in dict_line.items():
    if _v == min_keys:
        delet_list.append(_k)
for i in line:
    if i in delet_list:
        continue
    else:
        new_str.append(i)
print(''.join(new_str))