instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a guy looking at a tennis ball with a goofy look'. Replace the letter 'a' with 'x' in the sentence.
answer:
x guy looking xt x tennis bxll with x goofy look


question:
Sentence: 'a zebra is eating hay in a fenced enclosure'. Replace the letter 'e' with 'i' in the sentence.
answer:
a zibra is iating hay in a fincid inclosuri


question:
Sentence: 'a large bathroom with a big soaking tub'. Replace the letter 'r' with 'i' in the sentence.
answer:

a laige bathioom with a big soaking tub