用Python写一个程序，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。只输出第一个次数最多的字母及次数，用空格隔开

可以使用Python中的字典来统计每个字母出现的次数：

string = input("请输入字符串：")
count_dict = {}
for char in string:
if char.isalpha(): # 只统计字母，忽略其他字符
if char in count_dict:
count_dict[char] += 1
else:
count_dict[char] = 1

max_count = 0
max_char = ''
for char, count in count_dict.items():
if count > max_count:
max_count = count
max_char = char

print(max_char, max_count)