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

Q: Sentence: 'a person on a surfboard riding in ocean waves'. Replace the letter 's' with 'g' in the sentence.

A: a pergon on a gurfboard riding in ocean waveg
****
Q: Sentence: 'a brown door  that says gentlemen and a toilet'. Replace the letter 'o' with 'f' in the sentence.

A: a brfwn dffr  that says gentlemen and a tfilet
****
Q: Sentence: 'the large wooden grandfather clock is against a brick wall'. Replace the letter 'o' with 'y' in the sentence.

A:
the large wyyden grandfather clyck is against a brick wall
****