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

Sentence: 'a black cat is sniffing a glass bottle'. Replace the letter 'c' with 'f' in the sentence.
a blafk fat is sniffing a glass bottle

Sentence: 'a clean, sterile bathroom with a shower, toilet, and sink'. Replace the letter 'n' with 'k' in the sentence.
a cleak, sterile bathroom with a shower, toilet, akd sikk

Sentence: 'white and orange trains on a railroad passing through a city'. Replace the letter 'o' with 'e' in the sentence.

white and erange trains en a railread passing threugh a city