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

Ex Input:
Sentence: 'chopsticks and oriental food in white dishes sit on a wooden table'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'people standing in a river surrounding an elephant some are touching it'. How many words contain the letter 'd' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a parking meter with a picture of a man holding a gun on its side'. How many words contain the letter 'o' in the sentence.

Ex Output:

3