As an exercise, write a function that takes a string as an argument and displays the letters backward, one per line.
下面就练习一下了，写一个函数，接收一个字符串做参数，然后倒序显示每一个字符，每行显示一个。
A standard exercise stage may consist of more than one string.
而一个标准程序射击的关卡可能由超过一个射击序列所组成。
A standard exercise stage may consist of more than one string.
而一个标准程序射击的关卡可能由超过一个射击序列所组成。
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