TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
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: 'nine geese flying south for the winter months'. Replace the letter 't' with 'f' in the sentence.

SOLUTION: nine geese flying soufh for fhe winfer monfhs

PROBLEM: Sentence: 'a man that is standing in the snow on skis'. Replace the letter 't' with 'y' in the sentence.

SOLUTION:
a man yhay is syanding in yhe snow on skis