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

Ex Input:
Sentence: 'a little girl is sitting in a suitcase in a library'. Replace the letter 't' with 'l' in the sentence.

Ex Output:
a lillle girl is silling in a suilcase in a library


Ex Input:
Sentence: 'a row of lawn chairs with umbrellas over them'. Replace the letter 'e' with 'x' in the sentence.

Ex Output:
a row of lawn chairs with umbrxllas ovxr thxm


Ex Input:
Sentence: 'several cows are in the public street by a car'. Replace the letter 'e' with 'd' in the sentence.

Ex Output:

sdvdral cows ard in thd public strddt by a car