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

Input: Consider Input: Sentence: 'a person holding onto a pink kite at the beach'. Find frequency of the letter 'n'

Output: 4


Input: Consider Input: Sentence: 'a woman swinging a tennis racquet towards a tennis ball'. Find frequency of the letter 'e'

Output: 3


Input: Consider Input: Sentence: 'the young child is happily holding a fresh vegetable'. Find frequency of the letter 'a'


Output: 3