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 with some scissors over a bowl'. Find frequency of the letter 's'

Output: 6


Input: Consider Input: Sentence: 'people waiting on a train platform in a wooded area'. Find frequency of the letter 'p'

Output: 3


Input: Consider Input: Sentence: 'a dog jumping up into the air to catch a frisbee'. Find frequency of the letter 'i'


Output: 4