TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man that is jumping a skateboard over something'. Replace the letter 'g' with 'j' in the sentence.

SOLUTION: a man that is jumpinj a skateboard over somethinj

PROBLEM: Sentence: 'a group of young adults are engaged in outdoor exercise'. Replace the letter 'g' with 'n' in the sentence.

SOLUTION: a nroup of younn adults are ennaned in outdoor exercise

PROBLEM: Sentence: 'a train car with graffiti and a mountain in the background'. Replace the letter 'a' with 'w' in the sentence.

SOLUTION:
w trwin cwr with grwffiti wnd w mountwin in the bwckground