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

Example Input: Sentence: 'a child holding a tv remote like a phone'. Replace the letter 'i' with 'b' in the sentence.
Example Output: a chbld holdbng a tv remote lbke a phone

Example Input: Sentence: 'a black velvety chair with chrome colored frame'. Replace the letter 'a' with 'z' in the sentence.
Example Output: z blzck velvety chzir with chrome colored frzme

Example Input: Sentence: 'a giraffe with its head next to a tree trunk'. Replace the letter 'w' with 't' in the sentence.
Example Output:
a giraffe tith its head next to a tree trunk