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Hat¡¯s Words

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 25025    Accepted Submission(s): 8778


Problem Description
A hat¡¯s word is a word in the dictionary that is the concatenation of exactly two other words in the dictionary.
You are to find all the hat¡¯s words in a dictionary.
 

Input
Standard input consists of a number of lowercase words, one per line, in alphabetical order. There will be no more than 50,000 words.
Only one case.
 

Output
Your output should contain all the hat¡¯s words, one per line, in alphabetical order.
 

Sample Input
a
ahat
hat
hatword
hziee
word
 

Sample Output
ahat
hatword
 

Author
´÷ñ×ÓµÄ
 

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