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

Input: Consider Input: Sentence: 'a plastic plastic plate topped with three different type of food'. Find frequency of the letter 'l'

Output: 3


Input: Consider Input: Sentence: 'a woman is playing an interactive video game'. Find frequency of the letter 't'

Output: 2


Input: Consider Input: Sentence: 'a lady watching a little kid snow skiing'. Find frequency of the letter 'h'


Output: 1