Task: Dependency parsing for the sentence. Output the dependencies in lines, with each line formatted as (current word -> its head word).
input: I didn't cook dinner yesterday because I went out with my dear wife.
output: I -> cook
did -> cook
n't -> cook
cook -> ROOT
dinner -> cook
yesterday -> cook
because -> went
I -> went
went -> cook
out -> went
with -> wife
my -> wife
dear -> wife
wife -> went