TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person is standing in the snow in skis'. Replace the letter 'g' with 'x' in the sentence.

SOLUTION: a person is standinx in the snow in skis

PROBLEM: Sentence: 'a person is waiting for a pizza to come out of an oven fired grill'. Replace the letter 's' with 'k' in the sentence.

SOLUTION: a perkon ik waiting for a pizza to come out of an oven fired grill

PROBLEM: Sentence: 'two dogs around a flower pot looking at something'. Replace the letter 'u' with 'z' in the sentence.

SOLUTION:
two dogs aroznd a flower pot looking at something