TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'an airplane moves through the skies above a snowy mountain range'. Replace the letter 'l' with 's' in the sentence.

SOLUTION: an airpsane moves through the skies above a snowy mountain range

PROBLEM: Sentence: 'two men and a dog are standing beside a building'. Replace the letter 'b' with 'y' in the sentence.

SOLUTION: two men and a dog are standing yeside a yuilding

PROBLEM: Sentence: 'a bathroom with a large white tub and his and her sinks'. Replace the letter 'r' with 's' in the sentence.

SOLUTION:
a bathsoom with a lasge white tub and his and hes sinks