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

Input: Consider Input: Sentence: 'two pepperoni pizzas and a cup on a counter'. Find frequency of the letter 'u'

Output: 2


Input: Consider Input: Sentence: 'a man in costume talking on a cell phone'. Find frequency of the letter 'm'

Output: 2


Input: Consider Input: Sentence: 'a person that is on his computer in the street'. Find frequency of the letter 'a'


Output: 2