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

Input: Consider Input: Sentence: 'the two dogs are playing in the pen together'. Find frequency of the letter 'o'

Output: 3


Input: Consider Input: Sentence: 'a large cooked pizza on a dining table'. Find frequency of the letter 'n'

Output: 3


Input: Consider Input: Sentence: 'a man listens to music with headphones on while on a park bench'. Find frequency of the letter 'c'


Output: 2