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

Ex Input:
Sentence: 'a car stopped at a red light at an intersection'. How many words contain the letter 'l' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a college student throws a frisbee in a field'. How many words contain the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'three snow boarders mid air on a jump'. How many words contain the letter 'a' in the sentence.

Ex Output:

3