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

Example Input: Sentence: 'a seafood dish served over a bowl of white rice'. Replace the letter 'e' with 'u' in the sentence.
Example Output: a suafood dish survud ovur a bowl of whitu ricu

Example Input: Sentence: 'a mouse and keyboard sitting on a wooden desk'. Replace the letter 'a' with 'n' in the sentence.
Example Output: n mouse nnd keybonrd sitting on n wooden desk

Example Input: Sentence: 'a woman wearing a hat is sitting on a boat'. Replace the letter 'g' with 'k' in the sentence.
Example Output:
a woman wearink a hat is sittink on a boat