In this task, you need to count the number of times the given letter appears in the given sentence.

Ex Input:
Sentence: 'a bowl of granola with raspberries and honey on top with a spoon'. Find frequency of the letter 'w'

Ex Output:
3


Ex Input:
Sentence: 'the ingredients are ready on the wooden table'. Find frequency of the letter 'w'

Ex Output:
1


Ex Input:
Sentence: 'some people are celebrating in the big room'. Find frequency of the letter 'a'

Ex Output:

2