instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a couple giraffes walking through a fielded area'. Replace the letter 'e' with 'c' in the sentence.
answer:
a couplc giraffcs walking through a ficldcd arca

question:
Sentence: 'three men in a park playing a sport'. Replace the letter 'p' with 'w' in the sentence.
answer:
three men in a wark wlaying a swort

question:
Sentence: 'front of old, coal fired train, in motion'. Replace the letter 'n' with 's' in the sentence.
answer:
frost of old, coal fired trais, is motios