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

Example Input: Sentence: 'little tubs of rice and mixed vegetables for a meal'. Replace the letter 't' with 'z' in the sentence.
Example Output: lizzle zubs of rice and mixed vegezables for a meal

Example Input: Sentence: 'a plate with some meat, potatoes, carrots and some corn'. Replace the letter 'e' with 'q' in the sentence.
Example Output: a platq with somq mqat, potatoqs, carrots and somq corn

Example Input: Sentence: 'a vase sitting in a window sill with flowers'. Replace the letter 'a' with 'i' in the sentence.
Example Output:
i vise sitting in i window sill with flowers