字符串题目

1179 give my text back

To prepare for the English exam Little Ho collected many digital reading materials. Unfortunately the materials are messed up by a malware.

It is known that the original text contains only English letters (a-zA-Z), spaces, commas, periods and newlines, conforming to the following format:

1. Each sentence contains at least one word, begins with a letter and ends with a period.

2. In a sentence the only capitalized letter is the first letter.

3. In a sentence the words are separated by a single space or a comma and a space.

4. The sentences are separated by a single space or a single newline.

It is also known the malware changes the text in the following ways:

1. Changing the cases of letters.

2. Adding spaces between words and punctuations.

Given the messed text, can you help Little Ho restore the original text?

输入

A string containing no more than 8192 English letters (a-zA-Z), spaces, commas, periods and newlines which is the messed text.

输出

The original text.

样例输入

my Name  is Little   Hi.
His   name IS Little ho  ,  We are   friends.

样例输出

My name is little hi.
His name is little ho, we are friends.

思路很好想主要说题意

题意：输入一行字符串字符串的一开头可能有空格，最后也可能有很多空格

要求是输出合乎语法规则的字符串即开头字母大写，

，或 . 之后需要有空格，并且.之后首字母得大写，单词之前以一个空格隔开

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