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

Ex Input:
Sentence: 'there is a red tea pot that has flowers in it'. How many words contain the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bunch of people in a big field filled with bananas'. How many words contain the letter 'r' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'someone that is flying a really big kite'. How many words contain the letter 'u' in the sentence.

Ex Output:

0