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

Input: Consider Input: Sentence: 'a table topped with a cupcake on a picture of a cupcake'. Find frequency of the letter 'o'

Output: 3


Input: Consider Input: Sentence: 'two persons standing outside a moving sub train'. Find frequency of the letter 'a'

Output: 3


Input: Consider Input: Sentence: 'two guys are playing the wii, while the folks on the table look on'. Find frequency of the letter 't'


Output: 5