kolokviumska zagradi

import java.util.Scanner;
import java.util.Stack;

public class Zagradi_ispitna {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);

		String s = in.nextLine();
		Stack<Character> st = new Stack<Character>();
		boolean test = false;
		boolean test2 = false;
		boolean fin = false;
		for(int i=0; i<s.length(); i++)
		{
			st.push(s.charAt(i));
			if(test && st.peek()=='(')
				test2 = true;
			if(Character.isAlphabetic(st.peek()) || st.peek()=='+')
			{
				st.pop();
				test = true;
				continue;
			}

			if(st.peek()==')' && (test || test2))
			{
				st.pop();st.pop();
				if(!test)
				{
					test2 = false;
				}
				test = false;
			}
			else if(st.peek() == ')' && !test && !test2)
			{
				System.out.println("Najdeni se dupli zagradi");
				fin = true;
				break;
			}


		}
		if(!fin)
		System.out.println('/');
	}
}