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

Sentence: 'some brown black and white horses clouds and rocks'. Replace the letter 'a' with 'n' in the sentence.
some brown blnck nnd white horses clouds nnd rocks

Sentence: 'a teddy bear dressed in denim is laying on a floor'. Replace the letter 'i' with 'd' in the sentence.
a teddy bear dressed dn dendm ds laydng on a floor

Sentence: 'there are several brown cows eating grass outside'. Replace the letter 'o' with 'c' in the sentence.

there are several brcwn ccws eating grass cutside