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

Input: Consider Input: Sentence: 'a pizza is in a box on a table outside'. Find frequency of the letter 'u'

Output: 1


Input: Consider Input: Sentence: 'this is a sign in front of a large cathedral'. Find frequency of the letter 'a'

Output: 5


Input: Consider Input: Sentence: 'a person trying to flip a skateboard in a garage'. Find frequency of the letter 'a'


Output: 7