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

Example Input: Sentence: 'a woman sitting on a bench under a gazebo'. Replace the letter 's' with 'u' in the sentence.
Example Output: a woman uitting on a bench under a gazebo

Example Input: Sentence: 'the kitchen has a big screen tv and a lot of counter space'. Replace the letter 'h' with 'z' in the sentence.
Example Output: tze kitczen zas a big screen tv and a lot of counter space

Example Input: Sentence: 'a bunch of colorful flowers stands inside of a glass vase'. Replace the letter 'e' with 'u' in the sentence.
Example Output:
a bunch of colorful flowurs stands insidu of a glass vasu