Problems Description
<div class="O"> <div> <b>把英文字母表的小写字母按顺序和倒序打印出来。</b><span style="line-height:1.5;"><b>(</b></span><b>每行</b><span style="line-height:1.5;"><b>13</b></span><b>items</b><span style="line-height:1.5;"><b>)</b></span> </div> <div> <br /> </div> <div> <br /> </div> <div> </div> </div>
Input格式
Output格式
<b>输出四行</b>
Sample
Sample Input 1
no input needed
Sample Output 1
abcdefghijklm
nopqrstuvwxyz
zyxwvutsrqpon
mlkjihgfedcba
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