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

Input: Consider Input: Sentence: 'a group of people walking down a rain soaked street with umbrellas'. Find frequency of the letter 'w'

Output: 3


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 zebra stands on the dirt next to a water hole'. Find frequency of the letter 't'


Output: 6