#include "stdlib.h"
#include "string.h"
#include "stream.h"
class Stack {
   int _s;
   int* _top;
public:
   Stack() {
      _top = new int[100];
      _s = 0;
   }
   void push(int x) {
      *_top = x; _top++;
      if (x/2*2 == x) {
         *_top = x; _top++;
      }	
   }	
   void pop() {
      _s++;
   }
   void print() {
      _top--;
      for(int i = 0; i < _s; i++) {
         cout << *_top << '\n';
	_top--;
      }
   }
};
void main()
{
   Stack aStack;
   char data[8];
   strcpy(data,"9819049"); /***/
   for (int i=0; i<7; i++) {
     aStack.push(data[i]-'0');
     aStack.pop();
   }
   aStack.print();
}