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

Ex Input:
Sentence: 'a man on a boat pets a dog in a life jacket'. How many words contain the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a group of people on a beach beneath a cloudy sky'. How many words contain the letter 'g' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a group of people that are in the snow on skis'. How many words contain the letter 'o' in the sentence.

Ex Output:

5