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: 'a small dog sits in the rear window of a car'. Find frequency of the letter 'm'

Output: 1


Input: Consider Input: Sentence: 'there is a sink and bathtub in the bathroom'. Find frequency of the letter 'u'


Output: 1