TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a little girl is sitting in a suitcase in a library'. Replace the letter 't' with 'l' in the sentence.

SOLUTION: a lillle girl is silling in a suilcase in a library

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

SOLUTION: u busebull pluyer running to third buse from second

PROBLEM: Sentence: 'an image of a night scene with lots of people'. Replace the letter 'e' with 'g' in the sentence.

SOLUTION:
an imagg of a night scgng with lots of pgoplg