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

Input: Consider Input: Sentence: 'a stuffed animal sitting on an empty bed'. Find frequency of the letter 'u'

Output: 1


Input: Consider Input: Sentence: 'two laptop computers sitting on top of a white table'. Find frequency of the letter 'f'

Output: 1


Input: Consider Input: Sentence: 'oranges are sitting in a bowl on a table'. Find frequency of the letter 'a'


Output: 5