Data Structures: STACKS

From the stack in the picture below, what are the values of Y and Z if: Y = X.pop(); and Z = X.Peek(); ?

X.push(new Integer (4)); X.push(new Integer (3)); Integer y = x.pop(); X.push (new Integer (7)); X.push(new Integer (2)); X.push(new Integer (5)); X.push(new Integer (9)); Integer Y = X.pop(); x.push(new Integer (3)); X.push(new Integer (9))