TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a baseball player holding a bat in front of catcher and umpire'. Replace the letter 'i' with 'k' in the sentence.

SOLUTION: a baseball player holdkng a bat kn front of catcher and umpkre

PROBLEM: Sentence: 'a plate with some mean and vegetables on it'. Replace the letter 'a' with 'f' in the sentence.

SOLUTION: f plfte with some mefn fnd vegetfbles on it

PROBLEM: Sentence: 'a cat sitting on a bed with the cover ruffled a bit'. Replace the letter 'i' with 'u' in the sentence.

SOLUTION:
a cat suttung on a bed wuth the cover ruffled a but