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

Input: Consider Input: Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'

Output: 2


Input: Consider Input: Sentence: 'a double-decker bus covered in children's illustrations driving next to a van'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a pitcher who is in the middle of throwing the ball to the plate'. Find frequency of the letter 'h'


Output: 6