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

Ex Input:
Sentence: 'an elephant standing on a green grass area'. How many words contain the letter 'm' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'four white and blue street signs on a wooden pole'. How many words contain the letter 'u' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'two people skiing down a snowy slope surrounded by trees'. How many words contain the letter 'g' in the sentence.

Ex Output:

1


