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

Example Input: Sentence: 'a baseball player running on a baseball field'. Replace the letter 'e' with 'h' in the sentence.
Example Output: a bashball playhr running on a bashball fihld

Example Input: Sentence: 'a woman is talking on her white phone'. Replace the letter 'w' with 'r' in the sentence.
Example Output: a roman is talking on her rhite phone

Example Input: Sentence: 'there re people walking next to a train'. Replace the letter 'n' with 'b' in the sentence.
Example Output:
there re people walkibg bext to a traib