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

Example Input: Sentence: 'a man with a backpack on a motorcycle'. Replace the letter 't' with 'd' in the sentence.
Example Output: a man widh a backpack on a modorcycle

Example Input: Sentence: 'a white plate topped with two sandwich halves and a pile of potatoes chips'. Replace the letter 'o' with 'x' in the sentence.
Example Output: a white plate txpped with twx sandwich halves and a pile xf pxtatxes chips

Example Input: Sentence: 'a road sign is near the crowd of people'. Replace the letter 't' with 'd' in the sentence.
Example Output:
a road sign is near dhe crowd of people