输入文本， 输出该文本中出现频率最高的字符

from collections import Counter

def get_max_char(str):
    count = Counter(str)
    count_list = list(count.values())
    max_value = max(count_list)
    max_list = []
    for k, v in count.items():
        if v == max_value:
            max_list.append(k)
    return max_list

str1 = input()
print(get_max_char(str1))