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

Ex Input:
Sentence: 'vita mix blender with something in it already blended'. Replace the letter 'b' with 'a' in the sentence.

Ex Output:
vita mix alender with something in it already alended

Ex Input:
Sentence: 'a study table with computer, mouse and keyboard .photo frame are also kept'. Replace the letter 'u' with 'q' in the sentence.

Ex Output:
a stqdy table with compqter, moqse and keyboard .photo frame are also kept

Ex Input:
Sentence: 'a train car with graffiti and a mountain in the background'. Replace the letter 'a' with 'w' in the sentence.

Ex Output:
w trwin cwr with grwffiti wnd w mountwin in the bwckground