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

Ex Input:
Sentence: 'a big sign that is lit up near some buildings'. How many words contain the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a line of very tall buildings next to a clock tower'. How many words contain the letter 'o' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a man with a surprised look posing for a picture with people a bicycle and cars in the background'. How many words contain the letter 'c' in the sentence.

Ex Output:

4