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

Input: Consider Input: Sentence: 'a woman in a messy kitchen with a child'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a man makes some cock tales at a desk'. Find frequency of the letter 'k'

Output: 3


Input: Consider Input: Sentence: 'a meal of hot dogs and stuffed vegetables'. Find frequency of the letter 'f'


Output: 3