In this task, you need to count the number of words in a sentence that contain the given letter

Ex Input:
Sentence: 'five sheep out in an open field eating straw'. How many words contain the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a crowd of people flying kites near the capitol building'. How many words contain the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'two skiers in a race racing  on a course while onlookers watch'. How many words contain the letter 'c' in the sentence.

Ex Output:

4