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

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 is a purse on the floor with its contents spilled out'. Replace the letter 'd' with 'v' in the sentence.

Ex Output:
there is a purse on the floor with its contents spillev out


Ex Input:
Sentence: 'there are two woman laughing and playing a video game'. Replace the letter 'm' with 'k' in the sentence.

Ex Output:

there are two wokan laughing and playing a video gake