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

Ex Input:
Sentence: 'a  woman standing next to a man on a motorcycle in front of a market'. Find frequency of the letter 'l'

Ex Output:
1


Ex Input:
Sentence: 'a baby calf has a tag on its right ear'. Find frequency of the letter 'n'

Ex Output:
1


Ex Input:
Sentence: 'a large plate of waffles is next to plates with slices of peaches'. Find frequency of the letter 'e'

Ex Output:

8