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

Input: Consider Input: Sentence: 'the skateboarder has on red and black sneakers and is riding a skateboard'. Find frequency of the letter 'g'

Output: 1


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: 'there are couches and chairs in the room'. Find frequency of the letter 'o'


Output: 3