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: 'bathroom scene with a black cat going behind the door'. Find frequency of the letter 'e'

Output: 4


Input: Consider Input: Sentence: 'two giraffes with their necks crossed, forming an x'. Find frequency of the letter 'e'


Output: 4