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

Input: Consider Input: Sentence: 'pedestrian in stripe clothing standing on street corner'. Find frequency of the letter 's'

Output: 4


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 man sitting on an elephant in the middle of the water'. Find frequency of the letter 't'


Output: 6