TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'there is a stepladder situated over a toilet'. Replace the letter 'r' with 'x' in the sentence.

SOLUTION: thexe is a stepladdex situated ovex a toilet

PROBLEM: Sentence: 'a baseball player swings his bat at a pitch'. Replace the letter 's' with 'l' in the sentence.

SOLUTION: a baleball player lwingl hil bat at a pitch

PROBLEM: Sentence: 'two zebras standing around while a third zebra drinks from a pond'. Replace the letter 'e' with 'x' in the sentence.

SOLUTION:
two zxbras standing around whilx a third zxbra drinks from a pond