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 fancy clock is lit up on the street'. Replace the letter 'o' with 'f' in the sentence.
[A]: a fancy clfck is lit up fn the street

[Q]: Sentence: 'a herd of elephants is standing on an open plain'. Replace the letter 's' with 'a' in the sentence.
[A]:
a herd of elephanta ia atanding on an open plain