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

Ex Input:
Sentence: 'a tree by a house has a traffic sign attached to it'. How many words contain the letter 'm' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'computer and a monitor on a wooden desk next to a laptop'. How many words contain the letter 'm' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'three sheep in a field of grass near a steep hill'. How many words contain the letter 'u' in the sentence.

Ex Output:

0