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

Ex Input:
Sentence: 'a blue motorcycle parked next to a tree in a forest'. How many words contain the letter 'm' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'the black bears are together on the rocks eating outside'. How many words contain the letter 'y' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'commercial planes of all shapes and sizes landing and taking off at the airport'. How many words contain the letter 'd' in the sentence.

Ex Output:

3