instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a tennis racket is sitting in the middle of a tennis field'. Replace the letter 'i' with 'f' in the sentence.
answer:
a tennfs racket fs sfttfng fn the mfddle of a tennfs ffeld


question:
Sentence: 'a woman sitting in front of a laptop computer'. Replace the letter 'u' with 'o' in the sentence.
answer:
a woman sitting in front of a laptop compoter


question:
Sentence: 'a person under an open umbrella in the sand'. Replace the letter 'd' with 'h' in the sentence.
answer:

a person unher an open umbrella in the sanh