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 fire hydrant and a rolled up fire hose'. Replace the letter 'd' with 's' in the sentence.
Example Output: a fire hysrant ans a rolles up fire hose

Example Input: Sentence: 'a few zebras that are next to each other'. Replace the letter 'o' with 'u' in the sentence.
Example Output:
a few zebras that are next tu each uther