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

Ex Input:
Sentence: 'a gray cat is wearing a santa hat'. How many words contain the letter 'm' in the sentence.

Ex Output:
0

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 closeup of flowers in a vase outside'. How many words contain the letter 'x' in the sentence.

Ex Output:
0