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

Input: Consider Input: Sentence: 'a long row of tables displaying lots of fruit'. Find frequency of the letter 'o'

Output: 5


Input: Consider Input: Sentence: 'a surfer is in the middle of an ocean wave'. Find frequency of the letter 'i'

Output: 3


Input: Consider Input: Sentence: 'a side view mirror that has a bird looking in it'. Find frequency of the letter 'a'


Output: 4