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

Input: Consider Input: Sentence: 'a cat sprawls out and sleeps on its back on a lounge chair with an acorn theme'. Find frequency of the letter 'r'

Output: 3


Input: Consider Input: Sentence: 'the two dogs are playing in the pen together'. Find frequency of the letter 'o'

Output: 3


Input: Consider Input: Sentence: 'a close up of a plate of food with broccoli'. Find frequency of the letter 'f'


Output: 3