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

Input: Consider Input: Sentence: 'the man is holding a plastic sled with snow in it next to a child'. Find frequency of the letter 'g'

Output: 1


Input: Consider Input: Sentence: 'a group of workers washing and cleaning fruits and vegetables'. Find frequency of the letter 'i'

Output: 3


Input: Consider Input: Sentence: 'a bear standing straight up on his back legs near a tree'. Find frequency of the letter 'r'


Output: 4