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

Ex Input:
Sentence: 'an overhead view of a city cross walk on a rainy day features an array of colorful umbrellas'. Replace the letter 's' with 'd' in the sentence.

Ex Output:
an overhead view of a city crodd walk on a rainy day featured an array of colorful umbrellad


Ex Input:
Sentence: 'an older man wearing a suit and tie'. Replace the letter 'i' with 't' in the sentence.

Ex Output:
an older man weartng a sutt and tte


Ex Input:
Sentence: 'a horse and carriage are going down a narrow street'. Replace the letter 'a' with 'b' in the sentence.

Ex Output:

b horse bnd cbrribge bre going down b nbrrow street