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

Input: Consider Input: Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'

Output: 3


Input: Consider Input: Sentence: 'a photo of a small boat on a shore'. Find frequency of the letter 'f'

Output: 1


Input: Consider Input: Sentence: 'a restroom filled with urinals and a tiled floor'. Find frequency of the letter 'a'


Output: 4