#include <stdio.h>
#include <math.h>
#define inf 1000000000

long long a,b,c,k,r,delta,l1,l2;
long long d1[35000],d2[35000];
long long i,sol=0;
long double daux,aux,x1,x2,q11,q12,q21,q22;

int  main(){
     freopen("ecuatie.in","r",stdin);
     freopen("ecuatie.out","w",stdout);
     
     scanf ("%lld %lld %lld %lld",&a,&b,&c,&k);

     delta=(long long)b*b-4*a*c;
     r=sqrt((long double)delta);
     if ((long long)r*r!=delta){printf("-1\n");return 0;}
     x1=(long double)(-b-r)/(2*a);
     x2=(long double)(-b+r)/(2*a);
          
     return 0;
}