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

Ex Input:
Sentence: 'a close up of a grassy beach showing an umbrella and wind board'. Replace the letter 'a' with 'f' in the sentence.

Ex Output:
f close up of f grfssy befch showing fn umbrellf fnd wind bofrd


Ex Input:
Sentence: 'a bunch of signs on a pole on the street'. Replace the letter 'c' with 's' in the sentence.

Ex Output:
a bunsh of signs on a pole on the street


Ex Input:
Sentence: 'a green wall in bathroom with white and chrome fixtures'. Replace the letter 'o' with 'j' in the sentence.

Ex Output:

a green wall in bathrjjm with white and chrjme fixtures