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

Input: Consider Input: Sentence: 'a little child looking up to a camera holding a cell phone'. Find frequency of the letter 'g'

Output: 2


Input: Consider Input: Sentence: 'a black cat laying down on a bed'. Find frequency of the letter 'y'

Output: 1


Input: Consider Input: Sentence: 'a person sitting on concrete in front of a building, talking on cellphone'. Find frequency of the letter 't'


Output: 5