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

Example Input: Sentence: 'a dog wearing a hat on top of it's head'. Replace the letter 'g' with 'o' in the sentence.
Example Output: a doo wearino a hat on top of it's head

Example Input: Sentence: 'a woman is standing on a street curb'. Replace the letter 'a' with 't' in the sentence.
Example Output: t womtn is sttnding on t street curb

Example Input: Sentence: 'an intersection with traffic lights and lots of traffic'. Replace the letter 'g' with 'j' in the sentence.
Example Output:
an intersection with traffic lijhts and lots of traffic