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

Input: Consider Input: Sentence: 'tow birds flying by a long necked crane'. Find frequency of the letter 'f'

Output: 1


Input: Consider Input: Sentence: 'a group of workers washing and cleaning fruits and vegetables'. Find frequency of the letter 'i'

Output: 3


Input: Consider Input: Sentence: 'a bunch of different cupcakes that are going into the oven'. Find frequency of the letter 'e'


Output: 6