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

Ex Input:
Sentence: 'a clock tower next to a building in a city'. How many words contain the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'several men standing up in a large room holding wii controllers'. How many words contain the letter 'h' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a couple of rhinos standing in a field near a zebra'. How many words contain the letter 'o' in the sentence.

Ex Output:

3