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

Input: Consider Input: Sentence: 'a couple of items that are on the wall'. Find frequency of the letter 'm'

Output: 1


Input: Consider Input: Sentence: 'a man riding a skateboard up the side of a ramp'. Find frequency of the letter 'u'

Output: 1


Input: Consider Input: Sentence: 'a pizza is being prepared to be cooked'. Find frequency of the letter 'd'


Output: 2