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

Input: Consider Input: Sentence: 'a woman holds a wine glass upside down while wearing rabbit ears and staring at a bottle of wine'. Find frequency of the letter 'a'

Output: 11


Input: Consider Input: Sentence: 'a crowd of fans watch soccer players from stadium seating'. Find frequency of the letter 'f'

Output: 3


Input: Consider Input: Sentence: 'an image of a man that is playing soccer'. Find frequency of the letter 'i'


Output: 3