TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'an umbrella sitting on top of a hill next to a body of water'. Replace the letter 't' with 'b' in the sentence.

SOLUTION: an umbrella sibbing on bop of a hill nexb bo a body of waber

PROBLEM: Sentence: 'a giraffe standing alone with a low fence behind it'. Replace the letter 't' with 'o' in the sentence.

SOLUTION: a giraffe soanding alone wioh a low fence behind io

PROBLEM: Sentence: 'a man riding skis down a snow covered slope'. Replace the letter 'o' with 'z' in the sentence.

SOLUTION:
a man riding skis dzwn a snzw czvered slzpe