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

Ex Input:
Sentence: 'a group of people walking along a dirty snow covered road'. Replace the letter 'n' with 'i' in the sentence.

Ex Output:
a group of people walkiig aloig a dirty siow covered road


Ex Input:
Sentence: 'an umbrella sitting on top of a hill next to a body of water'. Replace the letter 't' with 'b' in the sentence.

Ex Output:
an umbrella sibbing on bop of a hill nexb bo a body of waber


Ex Input:
Sentence: 'the boy is holding his puppy that has a hat on'. Replace the letter 's' with 'g' in the sentence.

Ex Output:

the boy ig holding hig puppy that hag a hat on