#include <iostream>
#include <cmath>
using namespace std;

int main()
{ int t;
int x;
int y;
int z;
int a;


while(x ,y ,z ,a >0)
{
cin >> x;

cin >> y ;

cin >> z ;

cin >> a;

if (y/x == z/y == a/z && y%x == z%y== a%z== 0)
{

int b= a*(y/x);
cout << x << y << z << a << b << endl;

}


if (y-x == z-y == a-z)
{

int b=a+(a-z);

cout << x << y << z << a << b ;

}
else
{
cout << "this is wrong" << endl;
}
}
system ("pause");
return 0 ;
}