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

[EX Q]: Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'
[EX A]: 3

[EX Q]: Sentence: 'a group of people having dinner and drinking wine'. Find frequency of the letter 'r'
[EX A]: 3

[EX Q]: Sentence: 'a vase with pink flowers and a cloth at the bottom'. Find frequency of the letter 't'
[EX A]:
6