TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a study features the color green and old-fashioned furniture'. Replace the letter 'e' with 'd' in the sentence.

SOLUTION: a study fdaturds thd color grddn and old-fashiondd furniturd

PROBLEM: Sentence: 'a zebra standing by a pile of large rocks'. Replace the letter 'i' with 'x' in the sentence.

SOLUTION: a zebra standxng by a pxle of large rocks

PROBLEM: Sentence: 'a green glass with chrystal ice cycles and a package of socks in front of a window'. Replace the letter 'c' with 'n' in the sentence.

SOLUTION:
a green glass with nhrystal ine nynles and a pankage of sonks in front of a window