本文共 604 字，大约阅读时间需要 2 分钟。

实现代码

if __name__ == '__main__':    line = input()    chars_count = {
   }    for i in range(len(line)):        c = line[i]        if 96 < ord(c) < 123 or 64 < ord(c) < 91:            c = c.lower()            if c not in chars_count.keys():                chars_count[c] = 1            else:                chars_count[c] += 1    max_num = 0    max_k = 'z'    for k in chars_count:        if int(chars_count[k]) > max_num:            max_num = chars_count[k]            max_k = k        elif int(chars_count[k]) == max_num and ord(k) < ord(max_k):            max_k = k    print("%s %d" % (max_k, max_num))

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