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 couple of buildings that has a bus out front'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a kid sits on a couch as he plays video games'. Find frequency of the letter 'o'


Output: 3