HZNUOJ

Compound Words

Tags:
Time Limit:  1 s      Memory Limit:   128 MB
Submission:10     AC:9     Score:99.43

Description

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.

Input

Standard input consists of a number of lowercase words, one per line, in alphabetical order. There will
be no more than 120,000 words.

Output

Your output should contain all the compound words, one per line, in alphabetical order.

Samples

input
a alien born less lien never nevertheless new newborn the zebra
output
alien newborn

Source

19 June, 2011 - Waterloo local contest