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

Ex Input:
Sentence: 'a giraffe and a zebra stare at each other'. Replace the letter 'g' with 'l' in the sentence.

Ex Output:
a liraffe and a zebra stare at each other


Ex Input:
Sentence: 'a street light is near a large building'. Replace the letter 'n' with 'c' in the sentence.

Ex Output:
a street light is cear a large buildicg


Ex Input:
Sentence: 'a dog wearing a pink life jacket sitting on a surf board in the ocean'. Replace the letter 'c' with 'y' in the sentence.

Ex Output:

a dog wearing a pink life jayket sitting on a surf board in the oyean