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

Input: Consider Input: Sentence: 'one man grabbing another at a table while laughing'. Find frequency of the letter 'n'

Output: 5


Input: Consider Input: Sentence: 'a couple of buildings that has a bus out front'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a woman holds the reins of a saddled horse'. Find frequency of the letter 'm'


Output: 1