Write a Java method which returns the stack element at a given index.

Please send your responses to techinterview@firstmeta.com

All of the following requirements must be met.

	- If the index is out of range, an Exception must be thrown (any Exception will do).
	- The stack object passed into the method must remain unmodified upon
	  return ( even if an Exception was thrown )
	- Only use a subset of the push(), pop(), empty(), and peek() methods on
	  the Stack.
	- Bonus points for using as few of the above methods as possible.
	- Bonus points for terseness of your program.
	- Do not define any other methods.
	- Do not create any other objects in the method, including Strings and
	  arrays; use only primitive types

Method signature:
	int getStackElement( Stack<Integer> stack, int index ) throws Exception

		stack -- stack object, should be unchanged upon return
		index -- 0-based index of element to return counting from the top of the stack

Example:

	Stack<Integer> stack = new Stack<Integer>();
	stack.push(10);
	stack.push(20);
	stack.push(30);
	stack.push(40);
	stack.push(50);
	stack.push(60);
	getStackElement(stack, 2); // returns 40
	getStackElement(stack, 6); // throws an exception