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

Ex Input:
Sentence: 'two giraffes with their heads in the tree'. How many words contain the letter 'o' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a woman bent down on the street holding her umbrella'. How many words contain the letter 'x' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a passenger train full of people comming down the track'. How many words contain the letter 'u' in the sentence.

Ex Output:
1