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

Sentence: 'some brown black and white horses clouds and rocks'. Replace the letter 'a' with 'n' in the sentence.
some brown blnck nnd white horses clouds nnd rocks

Sentence: 'the person rides down the path atop the pink skateboard'. Replace the letter 'e' with 'c' in the sentence.
thc pcrson ridcs down thc path atop thc pink skatcboard

Sentence: 'a boat sitting in the water at a beach with people swimming'. Replace the letter 'g' with 'h' in the sentence.
a boat sittinh in the water at a beach with people swimminh