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

Input: Consider Input: Sentence: 'a pizza is in a box on a table outside'. Find frequency of the letter 'u'

Output: 1


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 woman skiing down a ski slope with neon colored ski poles'. Find frequency of the letter 'o'


Output: 7