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

Input: Consider Input: Sentence: 'a white toilet sitting next to a toilet paper roller'. Find frequency of the letter 'o'

Output: 4


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 baseball player throwing a ball from the mound'. Find frequency of the letter 'b'


Output: 3