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

Ex Input:
Sentence: 'a large airplane flying over a dry grass hillside'. How many words contain the letter 'e' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'an old airplane sitting on top of a field'. How many words contain the letter 'h' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a group of people standing in two rows holding umbrellas'. How many words contain the letter 'u' in the sentence.

Ex Output:

2