TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a blue and white train is coming down some tracks'. Replace the letter 'b' with 'u' in the sentence.

SOLUTION: a ulue and white train is coming down some tracks

PROBLEM: Sentence: 'a man is posing in a desert, leaning on a sign with an image of a camel on it'. Replace the letter 'i' with 'r' in the sentence.

SOLUTION: a man rs posrng rn a desert, leanrng on a srgn wrth an rmage of a camel on rt

PROBLEM: Sentence: 'the lights of a scoreboard are bright during the baseball game'. Replace the letter 'd' with 'm' in the sentence.

SOLUTION:
the lights of a scoreboarm are bright muring the baseball game