instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a group of three giraffes standing around a fence'. Replace the letter 't' with 'a' in the sentence.
answer:
a group of ahree giraffes saanding around a fence


question:
Sentence: 'a man with scruffy hair wearing a tie and glasses'. Replace the letter 'r' with 'f' in the sentence.
answer:
a man with scfuffy haif weafing a tie and glasses


question:
Sentence: 'a man sitting down while texting on his cellphone'. Replace the letter 't' with 'j' in the sentence.
answer:

a man sijjing down while jexjing on his cellphone