TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
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: 'giraffe standing on a pile of rocks reaching up to a branch with its mouth'. Replace the letter 'g' with 'n' in the sentence.

SOLUTION: niraffe standinn on a pile of rocks reachinn up to a branch with its mouth

PROBLEM: Sentence: 'a guy standing in some deep snow on a hill'. Replace the letter 'o' with 'h' in the sentence.

SOLUTION:
a guy standing in shme deep snhw hn a hill