In this task, you need to replace a letter in the sentence with another given letter.

Example Input: Sentence: 'large stuffed toy bear sitting next to tree with assortment of bagged items'. Replace the letter 'y' with 'u' in the sentence.
Example Output: large stuffed tou bear sitting next to tree with assortment of bagged items

Example Input: Sentence: 'wine is being poured into a wine glass with a syringe'. Replace the letter 'e' with 'y' in the sentence.
Example Output: winy is bying pouryd into a winy glass with a syringy

Example Input: Sentence: 'two airplanes that are sitting on the asphalt'. Replace the letter 'w' with 'z' in the sentence.
Example Output:
tzo airplanes that are sitting on the asphalt