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

Ex Input:
Sentence: 'a clock in the middle of a building'. How many words contain the letter 'x' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a couple sitting on seats on a train'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'people are standing outside of a hut with a cow'. How many words contain the letter 'l' in the sentence.

Ex Output:

1