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

Ex Input:
Sentence: 'a geoup of people on bicycles coming down a street'. Replace the letter 'i' with 'x' in the sentence.

Ex Output:
a geoup of people on bxcycles comxng down a street

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 large flower arrangement with daisies in a floral vase'. Replace the letter 'o' with 'q' in the sentence.

Ex Output:
a large flqwer arrangement with daisies in a flqral vase