TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man and a child skiing down a mountain on a trail'. Replace the letter 'n' with 'm' in the sentence.

SOLUTION: a mam amd a child skiimg dowm a moumtaim om a trail

PROBLEM: Sentence: 'a safari setting at a zoo with two giraffes and a zebra'. Replace the letter 'n' with 'g' in the sentence.

SOLUTION: a safari settigg at a zoo with two giraffes agd a zebra

PROBLEM: Sentence: 'two zebras standing near some rocks in a field'. Replace the letter 's' with 'j' in the sentence.

SOLUTION:
two zebraj jtanding near jome rockj in a field