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

Example Input: Sentence: 'a man in a field standing as a ball comes through the air towards him'. Replace the letter 'u' with 'j' in the sentence.
Example Output: a man in a field standing as a ball comes throjgh the air towards him

Example Input: Sentence: 'a man extends his arm with a frisbee in hand as another reaches to grab it while teammates watch'. Replace the letter 'a' with 'g' in the sentence.
Example Output: g mgn extends his grm with g frisbee in hgnd gs gnother regches to grgb it while tegmmgtes wgtch

Example Input: Sentence: 'a picture of a person that is in the water'. Replace the letter 'r' with 'w' in the sentence.
Example Output:
a pictuwe of a pewson that is in the watew