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

Example Input: Sentence: 'a baseball player running to third base from second'. Replace the letter 'a' with 'u' in the sentence.
Example Output: u busebull pluyer running to third buse from second

Example Input: Sentence: 'there are people camping and flying kites in a field'. Replace the letter 't' with 'j' in the sentence.
Example Output: jhere are people camping and flying kijes in a field

Example Input: Sentence: 'a person standing on some skis going through the snow'. Replace the letter 'o' with 'l' in the sentence.
Example Output:
a persln standing ln slme skis gling thrlugh the snlw