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

Input: Consider Input: Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'

Output: 5


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 adult on skis is standing near a group of children with skis on'. Find frequency of the letter 'i'


Output: 6