public class ExprChecker {

	// we need a stack
	public static final int MAX=100;
	public static String[] stackContent = new String[MAX];
	public static int size = 0;

	public static void push(String str){
		stackContent[size] = str;
		size = size + 1;
	}

	public static String pop(){
		size = size - 1;
		return stackContent[size];
	}

	public static boolean isEmpty(){
		//return (size == 0);
		if(size == 0)
			return true;
		else 
			return false;
	}



	public static void main(String[] args) {

		boolean wellFormed = true;

		for(int i=0; i < args.length; i++){
			if(isOpening(args[i])){
				push(args[i]);
			}else{
				if(isEmpty()){
					wellFormed = false;
				}else{
					String prev = pop();
					if(!match(args[i], prev)){
						wellFormed = false;
					}					
				}
			}
		}
		
		if(isEmpty()){
			wellFormed = false;
		}

		System.out.println("You entered: ");
		for(int i=0; i < args.length; i++){
			System.out.print(args[i] + " ");
		}
		System.out.println();

		if(wellFormed){
			System.out.println(": )");
		}
			else{	
				System.out.println(":(");
		}

	}

}