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

Input: Consider Input: Sentence: 'one man grabbing another at a table while laughing'. Find frequency of the letter 'n'

Output: 5


Input: Consider Input: Sentence: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'

Output: 5


Input: Consider Input: Sentence: 'a mother and child examine a fire hydrant'. Find frequency of the letter 'n'


Output: 3