#include<stdio.h>
#include<math.h>
long a,b,c,k,lim,i,n,nr,d,x,y,r,v[101];
int main()
{
freopen("ecuatie.in","r",stdin);
freopen("ecuatie.out","w",stdout);
scanf("%ld%ld%ld%ld",&a,&b,&c,&k);
printf("-1");
/*lim=sqrt(a);
for(i=1;i<=lim;i++)
  if(n%i==0)
    {
    v[++nr]=a/i;
    v[++nr]=i;
    }
if(lim*lim==a)
  nr--;
d=sqrt(b*b-4*a*c);
x=b*(-1)/(2*a)+d/(2*a);
y=b*(-1)/(2*a)-d/(2*a);
if(k>nr*4)
  {
  printf("-1");
  return 0;
  }
if(k<=nr*2)
  {
  r=k%2;
  k=(k+1)/2;
  }
else
  {
  k=k-nr*2;
  r=k%2;
  k=(k+1)/2;
  if(r)
    if(((-1)*x)<((-1)*y))
      printf("(%ldx%ld %ld",v[k],v[k]*(-1)*x);
  }*/
return 0;
}