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

Sentence: 'a red train sitting at an empty station'. Replace the letter 'i' with 'h' in the sentence.
a red trahn shtthng at an empty stathon

Sentence: 'a couple of giraffe standing next to each other near  a fence'. Replace the letter 'f' with 'j' in the sentence.
a couple oj girajje standing next to each other near  a jence

Sentence: 'there is a skier that is going down the hill'. Replace the letter 'i' with 'z' in the sentence.

there zs a skzer that zs gozng down the hzll