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 walking with a child that is in a wheelchair'. Find frequency of the letter 'k'

Output: 1


Input: Consider Input: Sentence: 'a gray airplane with metal petals on the wings takes off from an airport'. Find frequency of the letter 'i'

Output: 4


Input: Consider Input: Sentence: 'the professional baseball player s standing in the correct stance'. Find frequency of the letter 'c'


Output: 3