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

Ex Input:
Sentence: 'a man walking in front of a train station'. How many words contain the letter 'o' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a large airplane flying over a dry grass hillside'. How many words contain the letter 'e' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a pastoral area has trees overgrown vegetation and a line of barrels in its furthest part while beyond the barrel line in the foreground sits an area of short grass that is being grazed by several knots of cows'. How many words contain the letter 'g' in the sentence.

Ex Output:

6