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

Input: Consider Input: Sentence: 'a woman sitting in front of a giant slice of cheese pizza'. Find frequency of the letter 'e'

Output: 4


Input: Consider Input: Sentence: 'a dilapidated bench in a park under a tree'. Find frequency of the letter 'p'

Output: 2


Input: Consider Input: Sentence: 'a close up of a person slice of pizza from a pan'. Find frequency of the letter 'a'


Output: 5