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

Input: Consider Input: Sentence: 'a baseball player dropping his bat and starting to run'. Find frequency of the letter 'o'

Output: 2


Input: Consider Input: Sentence: 'a man in a black wet suit rides an orange surfboard on the water'. Find frequency of the letter 'o'

Output: 3


Input: Consider Input: Sentence: 'a number of cows in a field near many trees'. Find frequency of the letter 'e'


Output: 5