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: 'town clocks affixed to a tall, brick building'. Find frequency of the letter 'r'

Output: 1


Input: Consider Input: Sentence: 'the bedroom is decorated in a simplistic style'. Find frequency of the letter 'a'


Output: 2