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

Ex Input:
Sentence: 'adults with helmets sitting on tricycles made for children'. How many words contain the letter 'r' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'some soldiers cutting into a big sheet cake on a table'. How many words contain the letter 'c' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'there are men eating and drinking in the kitchen'. How many words contain the letter 'u' in the sentence.

Ex Output:

0