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

Ex Input:
Sentence: 'the two boys are eating large carrots while sitting on a blanket'. Replace the letter 'a' with 'q' in the sentence.

Ex Output:
the two boys qre eqting lqrge cqrrots while sitting on q blqnket


Ex Input:
Sentence: 'a bike sitting parked next to a cart in front of some boxes'. Replace the letter 't' with 'x' in the sentence.

Ex Output:
a bike sixxing parked nexx xo a carx in fronx of some boxes


Ex Input:
Sentence: 'a fancy clock is lit up on the street'. Replace the letter 'o' with 'f' in the sentence.

Ex Output:

a fancy clfck is lit up fn the street