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

Example Input: Sentence: 'a woman standing in front of a bear in an enclosure'. Replace the letter 'e' with 'r' in the sentence.
Example Output: a woman standing in front of a brar in an rnclosurr

Example Input: Sentence: 'a pink table topped with plates and bowls of food'. Replace the letter 'p' with 'x' in the sentence.
Example Output: a xink table toxxed with xlates and bowls of food

Example Input: Sentence: 'the children are all getting together at the event'. Replace the letter 't' with 'w' in the sentence.
Example Output:
whe children are all gewwing wogewher aw whe evenw