In this task, you need to replace a letter in the sentence with another given letter.

Sentence: 'a big bowl of brown food halfway in a small oven'. Replace the letter 'v' with 'k' in the sentence.
a big bowl of brown food halfway in a small oken

Sentence: 'a group of people riding skis on a snowy surface'. Replace the letter 'p' with 'i' in the sentence.
a groui of ieoile riding skis on a snowy surface

Sentence: 'several giraffes in thick green brush with a huge mountain in the background'. Replace the letter 'h' with 'f' in the sentence.

several giraffes in tfick green brusf witf a fuge mountain in tfe background