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

Example Input: Sentence: 'vita mix blender with something in it already blended'. Replace the letter 'b' with 'a' in the sentence.
Example Output: vita mix alender with something in it already alended

Example Input: Sentence: 'a metal bowl filled with lots of red apples'. Replace the letter 'b' with 'x' in the sentence.
Example Output: a metal xowl filled with lots of red apples

Example Input: Sentence: 'a closeup view of a desk with a keyboard, mouse, and monitor'. Replace the letter 'm' with 'g' in the sentence.
Example Output:
a closeup view of a desk with a keyboard, gouse, and gonitor