In this task, you need to replace a letter in the sentence with another given letter.

Sentence: 'a dog laying in front of a horses stall with the horse peeking over the half door'. Replace the letter 'a' with 'b' in the sentence.
b dog lbying in front of b horses stbll with the horse peeking over the hblf door

Sentence: 'some tracks for a rail way system near a building'. Replace the letter 'a' with 'h' in the sentence.
some trhcks for h rhil why system nehr h building

Sentence: 'a couple of large pizzas that are on a table'. Replace the letter 'p' with 'r' in the sentence.

a courle of large rizzas that are on a table