In this task, you're given an input that contains two words, and your task is to predict the correct preposition that connects these two words. Predict the preposition that explicitly conveys both words' meaning, e.g., Word1: king 
 Word2: fort: "king of fort". Possible prepositions are: "of", "on", "in", "for", "from", "about", and "with".

Ex Input:
Word1: systems 
 Word2: treatment

Ex Output:
for


Ex Input:
Word1: engine 
 Word2: titanium

Ex Output:
of


Ex Input:
Word1: budget 
 Word2: development

Ex Output:

for