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

Example Input: Sentence: 'three men playing in a men's doubles tennis match'. Replace the letter 'e' with 'l' in the sentence.
Example Output: thrll mln playing in a mln's doublls tlnnis match

Example Input: Sentence: 'a white bathroom with a stand alone sink and a shower curtain'. Replace the letter 'a' with 'm' in the sentence.
Example Output: m white bmthroom with m stmnd mlone sink mnd m shower curtmin

Example Input: Sentence: 'a giraffe sticking out is tongue to grasp an item from a person's hand'. Replace the letter 'g' with 'k' in the sentence.
Example Output:
a kiraffe stickink out is tonkue to krasp an item from a person's hand