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

Input: Consider Input: Sentence: 'a close up of a plate with a whole carrot'. Find frequency of the letter 'w'

Output: 2


Input: Consider Input: Sentence: 'a person riding a skate board on a city street'. Find frequency of the letter 'a'

Output: 5


Input: Consider Input: Sentence: 'a man standing in front of an oven with food baking in it'. Find frequency of the letter 'i'


Output: 6