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

Example Input: Sentence: 'a black velvety chair with chrome colored frame'. Replace the letter 'a' with 'z' in the sentence.
Example Output: z blzck velvety chzir with chrome colored frzme

Example Input: Sentence: 'a bunch of animals that are runing in a field'. Replace the letter 'm' with 'j' in the sentence.
Example Output: a bunch of anijals that are runing in a field

Example Input: Sentence: 'a group of sheep is standing in a grassy field'. Replace the letter 'g' with 'p' in the sentence.
Example Output:
a proup of sheep is standinp in a prassy field