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

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

Output: 1


Input: Consider Input: Sentence: 'a man standing on a surf board in the ocean'. Find frequency of the letter 'f'

Output: 1


Input: Consider Input: Sentence: 'a picture of a very busy intersection with a subway line next to it'. Find frequency of the letter 'e'


Output: 6