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

Example Input: Sentence: 'a cake, pitcher, bowl and package of frosting sitting on a table'. Replace the letter 't' with 'g' in the sentence.
Example Output: a cake, pigcher, bowl and package of frosging sigging on a gable

Example Input: Sentence: 'a couple of giraffe standing next to each other near  a fence'. Replace the letter 'f' with 'j' in the sentence.
Example Output: a couple oj girajje standing next to each other near  a jence

Example Input: Sentence: 'a skateboarder is doing tricks at a skate park'. Replace the letter 't' with 'm' in the sentence.
Example Output:
a skameboarder is doing mricks am a skame park