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

Ex Input:
Sentence: 'a large orange cat sits in a chair outside'. Replace the letter 'e' with 'x' in the sentence.

Ex Output:
a largx orangx cat sits in a chair outsidx


Ex Input:
Sentence: 'a book shelf full of books and nick nacks '. Replace the letter 'o' with 'm' in the sentence.

Ex Output:
a bmmk shelf full mf bmmks and nick nacks 


Ex Input:
Sentence: 'there are two boats sailing through the water'. Replace the letter 'e' with 'a' in the sentence.

Ex Output:

thara ara two boats sailing through tha watar