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

Input: Consider Input: Sentence: 'cars parked outside if a retail store'. Find frequency of the letter 'd'

Output: 2


Input: Consider Input: Sentence: 'a cooked pizza on a silver platter with another in the background'. Find frequency of the letter 'e'

Output: 5


Input: Consider Input: Sentence: 'some elephants walking across a dirt road close to some mud'. Find frequency of the letter 'e'


Output: 5