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

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: 'a group of tennis players on a tennis court'. Find frequency of the letter 'o'

Output: 4


Input: Consider Input: Sentence: 'sliced red tomatoes sit next to a wine glass and a bottle of wine'. Find frequency of the letter 'f'


Output: 1