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

Input: Consider Input: Sentence: 'city two way street with cars lined up on both sides'. Find frequency of the letter 'h'

Output: 2


Input: Consider Input: Sentence: 'there is a person standing on a blue towel'. Find frequency of the letter 'n'

Output: 4


Input: Consider Input: Sentence: 'two cats that are sitting on a computer desk'. Find frequency of the letter 'c'


Output: 2