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

Ex Input:
Sentence: 'a skater looks ahead as he rides down a ramp'. Replace the letter 'n' with 'm' in the sentence.

Ex Output:
a skater looks ahead as he rides dowm a ramp

Ex Input:
Sentence: 'a couple of people that are petting a horse'. Replace the letter 'e' with 'p' in the sentence.

Ex Output:
a couplp of ppoplp that arp pptting a horsp

Ex Input:
Sentence: 'a n airplane in the desert with a line of people boarding'. Replace the letter 'a' with 'g' in the sentence.

Ex Output:
g n girplgne in the desert with g line of people bogrding