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

Input: Consider Input: Sentence: 'small airplane in the process of taking off'. Find frequency of the letter 'e'

Output: 3


Input: Consider Input: Sentence: 'a kitchen with hanging lights, an island with sink and bar stools, a refrigerator, small pantry door, wooden cabinets and shiny wood floor'. Find frequency of the letter 'n'

Output: 12


Input: Consider Input: Sentence: 'a kitchen with a stove with pots of food in them'. Find frequency of the letter 'd'


Output: 1