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

Input: Consider Input: Sentence: 'some food on plates next to each other on a table'. Find frequency of the letter 'e'

Output: 6


Input: Consider Input: Sentence: 'an old glass vase containing flowers on a glass table'. Find frequency of the letter 'b'

Output: 1


Input: Consider Input: Sentence: 'a woman decorating a fancy cake in her kitchen'. Find frequency of the letter 'r'


Output: 2