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

Ex Input:
Sentence: 'a white plate topped with two sandwich halves and a pile of potatoes chips'. Replace the letter 'o' with 'x' in the sentence.

Ex Output:
a white plate txpped with twx sandwich halves and a pile xf pxtatxes chips

Ex Input:
Sentence: 'a herd of black cattle grazing and lounging in a green field'. Replace the letter 'a' with 'q' in the sentence.

Ex Output:
q herd of blqck cqttle grqzing qnd lounging in q green field

Ex Input:
Sentence: 'a bed sitting next to a large window and a table with two chairs'. Replace the letter 'a' with 'o' in the sentence.

Ex Output:
o bed sitting next to o lorge window ond o toble with two choirs