instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a man walking his dog near a sandy area'. Replace the letter 'i' with 'g' in the sentence.
answer:
a man walkgng hgs dog near a sandy area

question:
Sentence: 'three young school girls waiting on a subway train platform'. Replace the letter 't' with 'o' in the sentence.
answer:
ohree young school girls waioing on a subway orain plaoform

question:
Sentence: 'very nice towel and traffic lights besides the road'. Replace the letter 't' with 'c' in the sentence.
answer:
very nice cowel and craffic lighcs besides che road