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

Ex Input:
Sentence: 'a group of people riding on top of snow boarding equipment'. Replace the letter 'e' with 'x' in the sentence.

Ex Output:
a group of pxoplx riding on top of snow boarding xquipmxnt


Ex Input:
Sentence: 'a chocolate cake decorated with strawberries on the side'. Replace the letter 'c' with 'x' in the sentence.

Ex Output:
a xhoxolate xake dexorated with strawberries on the side


Ex Input:
Sentence: 'a man on a snowboard on a snow hill'. Replace the letter 'o' with 'x' in the sentence.

Ex Output:

a man xn a snxwbxard xn a snxw hill