TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a close up of a grassy beach showing an umbrella and wind board'. Replace the letter 'a' with 'f' in the sentence.

SOLUTION: f close up of f grfssy befch showing fn umbrellf fnd wind bofrd

PROBLEM: Sentence: 'a large white sign with black lettering leaning against a metal fence'. Replace the letter 'e' with 'j' in the sentence.

SOLUTION: a largj whitj sign with black ljttjring ljaning against a mjtal fjncj

PROBLEM: Sentence: 'a young man holding a tennis racket and standing inside a tennis court'. Replace the letter 'a' with 'n' in the sentence.

SOLUTION:
n young mnn holding n tennis rncket nnd stnnding inside n tennis court