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

Ex Input:
Sentence: 'a study features the color green and old-fashioned furniture'. Replace the letter 'e' with 'd' in the sentence.

Ex Output:
a study fdaturds thd color grddn and old-fashiondd furniturd


Ex Input:
Sentence: 'a back pack and lap top sit on the kitchen counter'. Replace the letter 't' with 'k' in the sentence.

Ex Output:
a back pack and lap kop sik on khe kikchen counker


Ex Input:
Sentence: 'a black and white cat is looking at a banana'. Replace the letter 'o' with 'x' in the sentence.

Ex Output:

a black and white cat is lxxking at a banana