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

Input: Consider Input: Sentence: 'man is snow gear and skis skiing in the snow'. Find frequency of the letter 'i'

Output: 5


Input: Consider Input: Sentence: 'a construction sign is displayed on a street'. Find frequency of the letter 'i'

Output: 4


Input: Consider Input: Sentence: 'a biker bar with motorcycles parked in front of it'. Find frequency of the letter 'a'


Output: 3