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

Input: Consider Input: Sentence: 'soccer players on opposite teams fight for control over a ball'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a group of cars and house on truck passing in a street'. Find frequency of the letter 'i'

Output: 2


Input: Consider Input: Sentence: 'a person on a beach with a kite flying in the sky'. Find frequency of the letter 'e'


Output: 4