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

Example Input: Sentence: 'a teddy bear playing a drum and a teddy bear playing a guitar'. Replace the letter 'd' with 'm' in the sentence.
Example Output: a temmy bear playing a mrum anm a temmy bear playing a guitar

Example Input: Sentence: 'a pile of chopped up broccoli sits next to bottles of sauces'. Replace the letter 't' with 'y' in the sentence.
Example Output: a pile of chopped up broccoli siys nexy yo boyyles of sauces

Example Input: Sentence: 'a lighthouse and a clock shaped like a bear'. Replace the letter 'c' with 'o' in the sentence.
Example Output:
a lighthouse and a olook shaped like a bear