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

Example Input: Sentence: 'a big bowl of brown food halfway in a small oven'. Replace the letter 'v' with 'k' in the sentence.
Example Output: a big bowl of brown food halfway in a small oken

Example Input: Sentence: 'two knives are embedded in a wooden table'. Replace the letter 'a' with 'l' in the sentence.
Example Output: two knives lre embedded in l wooden tlble

Example Input: Sentence: 'a baby in front of a metal railing and an elephant standing behind the railing'. Replace the letter 'g' with 'u' in the sentence.
Example Output:
a baby in front of a metal railinu and an elephant standinu behind the railinu