文件名称:4_1string
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使用String类提供的函数，实现以下步骤：
（1） 用户从键盘输入两句英文句子。
（2） 把这两个句子连起来。
（3） 去掉句子里的非字母字符，并把这个句子反过来打印。
例如从键盘输入两句子：“Hi，my classmates”和 “How are you?”
最后打印结果应该为：uoyerawoHsetamssalcymiH
-Use String class provides functions to achieve the following steps: (1) user input from the keyboard a few words in English sentences. (2) to link these two sentences. (3) remove the sentence of non-alphabetic characters, and to print this sentence in turn. For example, two children from the keyboard: " Hi, my classmates" and " How are you?" Finally, print the results should be: uoyerawoHsetamssalcymiH
（1） 用户从键盘输入两句英文句子。
（2） 把这两个句子连起来。
（3） 去掉句子里的非字母字符，并把这个句子反过来打印。
例如从键盘输入两句子：“Hi，my classmates”和 “How are you?”
最后打印结果应该为：uoyerawoHsetamssalcymiH
-Use String class provides functions to achieve the following steps: (1) user input from the keyboard a few words in English sentences. (2) to link these two sentences. (3) remove the sentence of non-alphabetic characters, and to print this sentence in turn. For example, two children from the keyboard: " Hi, my classmates" and " How are you?" Finally, print the results should be: uoyerawoHsetamssalcymiH
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4_1string.cpp