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

Sentence: 'a large clock tower next to a building on a street'. Replace the letter 'c' with 'n' in the sentence.
a large nlonk tower next to a building on a street

Sentence: 'a couple of brown bears walking across a lush green field'. Replace the letter 'w' with 'o' in the sentence.
a couple of broon bears oalking across a lush green field

Sentence: 'a baseball player swings his bat behind his head'. Replace the letter 'h' with 'y' in the sentence.

a baseball player swings yis bat beyind yis yead