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

Input: Consider Input: Sentence: 'a full plate of food that includes rice and broccoli and carrots'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'a bus with two floors belonging to london country'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a delicious looking cake with one slice missing'. Find frequency of the letter 'k'


Output: 2