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

Input: Consider Input: Sentence: 'a stop sign near a rail road crossing sign'. Find frequency of the letter 'g'

Output: 3


Input: Consider Input: Sentence: 'a young girl skiing down a snowy mountain'. Find frequency of the letter 'l'

Output: 1


Input: Consider Input: Sentence: 'ikea catalogs are next to a vase with roses'. Find frequency of the letter 'e'


Output: 5