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

Example Input: Sentence: 'a large white sign with black lettering leaning against a metal fence'. Replace the letter 'e' with 'j' in the sentence.
Example Output: a largj whitj sign with black ljttjring ljaning against a mjtal fjncj

Example Input: Sentence: 'a man wearing a hat has his cell phone to his ear'. Replace the letter 'g' with 'w' in the sentence.
Example Output: a man wearinw a hat has his cell phone to his ear

Example Input: Sentence: 'elephants at the zoo standing in front of a waterfall'. Replace the letter 'h' with 'b' in the sentence.
Example Output:
elepbants at tbe zoo standing in front of a waterfall