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 blue bowl holding mashed bananas and oatmeal with a bottle of sugar and cinnamon sitting beside it'. Find frequency of the letter 'g'

Output: 3


Input: Consider Input: Sentence: 'a cat is perched on a toilet seat to drink from the bowl'. Find frequency of the letter 'r'


Output: 3