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

Input: Consider Input: Sentence: 'a crowd of people standing in front of a green train'. Find frequency of the letter 'g'

Output: 2


Input: Consider Input: Sentence: 'a person riding a camel in front of a truck'. Find frequency of the letter 't'

Output: 2


Input: Consider Input: Sentence: 'a green pasture with cattle spread around it'. Find frequency of the letter 'i'


Output: 2