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

Input: Consider Input: Sentence: 'a man holding a baseball bat an playing baseball'. Find frequency of the letter 'l'

Output: 6


Input: Consider Input: Sentence: 'a girl laying on a bed posing for a picture'. Find frequency of the letter 'i'

Output: 4


Input: Consider Input: Sentence: 'a plate of food is sown with lobster, corn, and sausage'. Find frequency of the letter 'i'


Output: 2