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

Input: Consider Input: Sentence: 'a little boy that has a toothbrush in his mouth'. Find frequency of the letter 'r'

Output: 1


Input: Consider Input: Sentence: 'a commuter bus in england by a clock tower building'. Find frequency of the letter 'w'

Output: 1


Input: Consider Input: Sentence: 'a all withe decorated living room with a big wide window'. Find frequency of the letter 'w'


Output: 5