#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
cout<<setprecision(4);
float a,b,c,x;
cin>>a>>b>>c;
if (a!=0){x=(c-b)/a;cout<<x;}
else if (b==c) {cout<<"NWR";}
else if (b!=c){cout<<"BR";}
return 0;
}
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