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

Example Input: Sentence: 'a rare picture of an individual within this image'. Replace the letter 'd' with 'z' in the sentence.
Example Output: a rare picture of an inzivizual within this image

Example Input: Sentence: 'a table with three different plates and several drinks on it'. Replace the letter 't' with 'x' in the sentence.
Example Output: a xable wixh xhree differenx plaxes and several drinks on ix

Example Input: Sentence: 'a tan clock tower is next to large trees'. Replace the letter 's' with 'r' in the sentence.
Example Output:
a tan clock tower ir next to large treer