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

Input: Consider Input: Sentence: 'two little girls playing with a bat and a tennis ball'. Find frequency of the letter 'w'

Output: 2


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 rounded metal shelf with a microwave on one of the shelves'. Find frequency of the letter 'h'


Output: 4