instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a baseball player swings his bat at a pitch'. Replace the letter 's' with 'l' in the sentence.
answer:
a baleball player lwingl hil bat at a pitch


question:
Sentence: 'an overhead view of a city cross walk on a rainy day features an array of colorful umbrellas'. Replace the letter 's' with 'd' in the sentence.
answer:
an overhead view of a city crodd walk on a rainy day featured an array of colorful umbrellad


question:
Sentence: 'a couple of cats on a mattress laying down'. Replace the letter 's' with 'u' in the sentence.
answer:

a couple of catu on a mattreuu laying down