Problems Description
<span style="color:#333333;font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;font-size:14px;line-height:20px;background-color:#FFFFFF;">从键盘输入两items字符，交换两items变量的值后反序输出。</span>
Input格式
<span style="font-size:14px;">从键盘任意两items字符。</span>
Output格式
<span style="font-size:14px;">反序输出两items字符</span><span style="font-size:14px;"></span><span style="font-size:14px;">，两items字符之间有一items空格，</span><span style="color:#333333;font-family:Monaco, Menlo, Consolas, 'Courier New', monospace;font-size:14px;line-height:20px;background-color:#FFFFFF;">行末有一items换行符。</span>
Sample
Sample Input 1
a b
Sample Output 1
b a
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