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

Example Input: Sentence: 'the two boys are eating large carrots while sitting on a blanket'. Replace the letter 'a' with 'q' in the sentence.
Example Output: the two boys qre eqting lqrge cqrrots while sitting on q blqnket

Example Input: Sentence: 'a toaster oven painted on the side of a wall'. Replace the letter 'e' with 'p' in the sentence.
Example Output: a toastpr ovpn paintpd on thp sidp of a wall

Example Input: Sentence: 'there is a woman and two girls sitting on the bench'. Replace the letter 'g' with 's' in the sentence.
Example Output:
there is a woman and two sirls sittins on the bench