N a box in a henhouse in which domestic chickens lay eggs 巢箱; 在鸡舍的盒子，自家养的鸡在里面下蛋
In the third phase of the experiment a male was placed in the cage over the box where the female had once been, and the amount of aggression towards this male from the nesting male was measured.
试验的第三阶段，是在原先放雌性白领姬鹟的笼子里放入新的雄性白领姬鹟，并测量盒子里的雄性白领姬鹟对这只新出现的雄性白领姬鹟的攻击行为。
The 41 males observed were nesting in boxes long used by the species, and a single attractive female was placed in an enclosure on top of each box.
被观察的41只雄性白领姬鹟被分别养在它们长久以来习惯的盒子里，每个盒子上附加一个笼子，里面各放一只漂亮的雌性白领姬鹟。
For each box sequence in the input file, output the length of the longest nesting string on one line followed on the next line by a list of the boxes that comprise this string in order.
对应输入的每个盒子序列，应在第一行输出最长的嵌套串长度，在下一行按顺序输入组成这个嵌套串的盒子列表。
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