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

Ex Input:
Sentence: 'a close up of a grassy beach showing an umbrella and wind board'. Replace the letter 'a' with 'f' in the sentence.

Ex Output:
f close up of f grfssy befch showing fn umbrellf fnd wind bofrd


Ex Input:
Sentence: 'this is a man and boy holding skis'. Replace the letter 'h' with 'l' in the sentence.

Ex Output:
tlis is a man and boy lolding skis


Ex Input:
Sentence: 'a father and son playing at the park'. Replace the letter 'y' with 'k' in the sentence.

Ex Output:

a father and son plaking at the park