In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'flower in a vase full of water sitting on a stand '. Find frequency of the letter 'l'

Answer: 3


Question: Sentence: 'tow birds flying by a long necked crane'. Find frequency of the letter 'f'

Answer: 1


Question: Sentence: 'a group of sheep are all outside in the soil together'. Find frequency of the letter 'o'

Answer:
5