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: 'some tracks for a rail way system near a building'. Replace the letter 'a' with 'h' in the sentence.
Example Output: some trhcks for h rhil why system nehr h building

Example Input: Sentence: 'a row of bikes parked next to each other'. Replace the letter 'o' with 'z' in the sentence.
Example Output:
a rzw zf bikes parked next tz each zther