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

Input: Consider Input: Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'

Output: 2


Input: Consider Input: Sentence: 'a bedroom with a neatly made bed and a laptop'. Find frequency of the letter 'l'

Output: 2


Input: Consider Input: Sentence: 'birds feeding on the neck of a giraffe'. Find frequency of the letter 's'


Output: 1