public class Fortolker {
	private static int[] stack = new int[20];
	private static int top=-1;

	public static void main(String[] args){
		for (int i=0; i<args.length;i++)
			doNumberOrAction(args[i]);
		printStack();
	}

	private static void doNumberOrAction(String numberOrAction){
		int number;
		try{
			number = Integer.parseInt(numberOrAction);
			top++;
			stack[top]=number;
		}catch(Exception notNumber){
			doAction(numberOrAction);
		}
	}

	private static void doAction2(String action){
		if (action.equals("+") ){
			top--;
			stack[top] = stack[top]+stack[top+1];
			return;
		}if (action.equals("¤") ){
			top--;
			stack[top] = stack[top]*stack[top+1];
			return;
		}if (action.equals("-") ){
			top--;
			stack[top] = stack[top]-stack[top+1];
			return;
		}if (action.equals("/") ){
			top--;
			stack[top] = stack[top]/stack[top+1];
			return;
		}if (action.equals("dup") ){
			top++;
			stack[top] = stack[top-1];
			return;
		}if (action.equals("swap") ){
			int tmp = stack[top];
			stack[top] = stack[top-1];
			stack[top-1] = tmp;
			return;
		}
	}

	private static void printStack(){
		System.out.print("Stack: ");
		for (int i=0;i<=top;i++)
			System.out.print(stack[i]+(i<top?", ":""));
		System.out.println();
	}
}