TASK DEFINITION: Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
PROBLEM: tatsuya shiji ( , shiji tatsuya, born october 20, 1938) is a former japanese football player.

SOLUTION: tatsuya shiji

PROBLEM: the demographics of pakistan are a study of the population and the people.

SOLUTION: demographics of pakistan

PROBLEM: arboriculture is both a practical skill and a science.

SOLUTION:
arboriculture