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

Sentence: 'a man is posing in a desert, leaning on a sign with an image of a camel on it'. Replace the letter 'i' with 'r' in the sentence.
a man rs posrng rn a desert, leanrng on a srgn wrth an rmage of a camel on rt

Sentence: 'a dog wearing a hat on top of it's head'. Replace the letter 'g' with 'o' in the sentence.
a doo wearino a hat on top of it's head

Sentence: 'two zebras are looking at the plants on the ground'. Replace the letter 'g' with 'n' in the sentence.

two zebras are lookinn at the plants on the nround