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

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 dog laying on the back of a boat in the water'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a first baseman jumps up to catch a ball'. Find frequency of the letter 'a'


Output: 6