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

Ex Input:
Sentence: 'a yellow street sign sitting on the side of a road'. Replace the letter 'a' with 'd' in the sentence.

Ex Output:
d yellow street sign sitting on the side of d rodd


Ex Input:
Sentence: 'the bus is trying to navigate though the london traffic'. Replace the letter 'a' with 'l' in the sentence.

Ex Output:
the bus is trying to nlviglte though the london trlffic


Ex Input:
Sentence: 'old black and white photo of people on a city street with a bus and cab on the street'. Replace the letter 'h' with 'i' in the sentence.

Ex Output:

old black and wiite pioto of people on a city street witi a bus and cab on tie street