Question

one day i saw a boy hiding behind a wall next to the staircase at school

Answer 1

I think the ques is incomplete.

Answer 2

Answer:

As being the principal of the school I usually go for a round in the school to check out the classes. One day going through my round I saw a boy hiding behind a wall next to the staircase. I asked him to come out.

The boy was not from our school. I asked him why you were hiding. He said he is an orphan and want to study. So I took him to an orphanage and admitted him there and then allowed him to study in my school.