instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a group of young adults are engaged in outdoor exercise'. Replace the letter 'g' with 'n' in the sentence.
answer:
a nroup of younn adults are ennaned in outdoor exercise


question:
Sentence: 'there is a woman holding a tennis racket'. Replace the letter 'l' with 's' in the sentence.
answer:
there is a woman hosding a tennis racket


question:
Sentence: 'a man standing on a field, holding a bat'. Replace the letter 'a' with 'r' in the sentence.
answer:

r mrn strnding on r field, holding r brt