【问题描述】 输入字符串，输出字符串中出现次数最多的字母及其出现次数。如果有多个字母出现次数一样，则按字符从小到大顺序输出字母及其出现次数。 【输入形式】 一个字符串。 【输出形式】 出现次数最多的字母及其出现次数 。用python写

# 输入字符串
str = input()

# 统计每个字母出现次数
count_dict = {}
for ch in str:
    if ch not in count_dict.keys():
        count_dict[ch] = 1
    else:
        count_dict[ch] += 1

# 找到出现次数最多的字母及其出现次数
max_count = 0
max_ch = ''
for ch, count in count_dict.items():
    if count > max_count:
        max_count = count
        max_ch = ch
    elif count == max_count:
        if ch < max_ch:
            max_ch = ch

# 输出结果
print(max_ch, max_count)