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

Ex Input:
Sentence: 'a man in a suit with his finger in his ear'. How many words contain the letter 'm' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'the young giraffe is standing near the fence'. How many words contain the letter 's' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'two males are playing with a white frisbee'. How many words contain the letter 'u' in the sentence.

Ex Output:
0