题解 | 删除字符串中出现次数最少的字符

s = input()

dic = {} # Initialize a dictionary to count the occurrence of the letters.
for char in s:
    if char not in dic:
        dic[char] = 1
    else:
        dic[char] += 1

lowest_occur = min(dic.values())

str_rem = '' # Use an empty string to store letters to remove
for key, value in dic.items(): # Use the .items() method to iterate over the key-value pairs.
    if value == lowest_occur:
        str_rem += key

for char in str_rem:
    s = s.replace(char, "") # Use the .replace() method to remove the specified characters in str_rem.

print(s)