Balanced Meals
This question is asked by Apple. You are serving people in a lunch line and need to ensure each person gets a "balanced" meal. A balanced meal is a meal where there exists the same number of food items as drink items. Someone is helping you prepare the meals and hands you food items (i.e. F) or a drink items (D) in the order specified by the items string. Return the maximum number of balanced meals you are able to create without being able to modify items.