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

Input: Consider Input: Sentence: 'a person is performing a stunt on a snowboard'. Find frequency of the letter 'p'

Output: 2


Input: Consider Input: Sentence: 'the man is holding a plastic sled with snow in it next to a child'. Find frequency of the letter 'g'

Output: 1


Input: Consider Input: Sentence: 'skiers with red coats in large snow covered field'. Find frequency of the letter 'a'


Output: 2