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

Example Input: Sentence: 'broccoli and a sweet potato are served on a white plate'. Replace the letter 'o' with 'c' in the sentence.
Example Output: brccccli and a sweet pctatc are served cn a white plate

Example Input: Sentence: 'people are standing outside in the parking lot'. Replace the letter 'i' with 'z' in the sentence.
Example Output: people are standzng outszde zn the parkzng lot

Example Input: Sentence: 'a female skier is pictured with her skis and poles'. Replace the letter 'a' with 'y' in the sentence.
Example Output:
y femyle skier is pictured with her skis ynd poles