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

Input: Consider Input: Sentence: 'a little boy standing near a couch and a table'. Find frequency of the letter 'i'

Output: 2


Input: Consider Input: Sentence: 'a lady is standing near a luggage stand at the air port'. Find frequency of the letter 'a'

Output: 9


Input: Consider Input: Sentence: 'horse viewed out from a bar window in a fenced in enclosure'. Find frequency of the letter 's'


Output: 2