TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a toddler on skis being held up by a grownup'. Replace the letter 'o' with 'k' in the sentence.

SOLUTION: a tkddler kn skis being held up by a grkwnup

PROBLEM: Sentence: 'a couple of brown bears walking across a lush green field'. Replace the letter 'w' with 'o' in the sentence.

SOLUTION: a couple of broon bears oalking across a lush green field

PROBLEM: Sentence: 'there is a red bus near a crane'. Replace the letter 'r' with 'e' in the sentence.

SOLUTION:
theee is a eed bus neae a ceane