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

Sentence: 'a baseball themed birthday cake is on a serving tray'. Find frequency of the letter 'g'
1

Sentence: 'a man holding a brown paper bag kite'. Find frequency of the letter 'b'
2

Sentence: 'a girl is about to hit a tennis ball as a crowd watchs'. Find frequency of the letter 'l'

3