当前你的浏览器版本过低，网站已在兼容模式下运行，兼容模式仅提供最小功能支持，网站样式可能显示不正常。
请尽快升级浏览器以体验网站在线编辑、在线运行等功能。
You are to find all the two-word compound words in a dictionary. A two-word compound word is a
word in the dictionary that is the concatenation of exactly two other words in the dictionary.
Standard input consists of a number of lowercase words, one per line, in alphabetical order. There will
be no more than 120,000 words.
Your output should contain all the compound words, one per line, in alphabetical order.
a alien born less lien never nevertheless new newborn the zebra
alien newborn
| 时间上限 | 内存上限 |
| 1000 MS | 128 MB |