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

Input: Consider Input: Sentence: 'girls posing of a picture one holding a tennis racket the other wearing a crown'. Find frequency of the letter 'g'

Output: 4


Input: Consider Input: Sentence: 'a bird in a tree looking up at branches'. Find frequency of the letter 'e'

Output: 3


Input: Consider Input: Sentence: 'the man is thinking while he works at his table'. Find frequency of the letter 'h'


Output: 5


