对给定一个英文文本文件，统计并输出26个英文字母（不区分大小写）的出现频率，并统计定冠词‘the’的出现次数及频率。 -Given an English text file, statistics and output the 26 English letters (not case-sensitive) frequency of occurrence and statistical definite article ' the'　the emergence of the number and frequency.