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

Sentence: 'a man with a backpack on a motorcycle'. Replace the letter 't' with 'd' in the sentence.
a man widh a backpack on a modorcycle

Sentence: 'a baseball player running to third base from second'. Replace the letter 'a' with 'u' in the sentence.
u busebull pluyer running to third buse from second

Sentence: 'a young girl on a pair of snow skis'. Replace the letter 'y' with 's' in the sentence.

a soung girl on a pair of snow skis