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

Input: Consider Input: Sentence: 'a man makes some cock tales at a desk'. Find frequency of the letter 'k'

Output: 3


Input: Consider Input: Sentence: 'a dog laying on the back of a boat in the water'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'an image of a night scene with a clock in the center'. Find frequency of the letter 'k'


Output: 1