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

Input: Consider Input: Sentence: 'there is a stop sign that has a reflection in a puddle'. Find frequency of the letter 'e'

Output: 5


Input: Consider Input: Sentence: 'a castle like bed room that has the era of templar knight similarities'. Find frequency of the letter 'm'

Output: 3


Input: Consider Input: Sentence: 'snow boarder in snow suit riding on board'. Find frequency of the letter 'o'


Output: 5