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

Input: Consider Input: Sentence: 'a man riding his skateboard down low as he turns'. Find frequency of the letter 'g'

Output: 1


Input: Consider Input: Sentence: 'a man in costume talking on a cell phone'. Find frequency of the letter 'm'

Output: 2


Input: Consider Input: Sentence: 'the people in the truck are riding in the parade'. Find frequency of the letter 'e'


Output: 7