#include <iostream>
#include <math.h>
#include <iomanip>
using namespace std;
int main()
{
long double a,b,c,x;
cin>>a>>b>>c;
if (a==0 && b!=c) cout<<"BR"<<endl;
else if( a==0 && b==c) cout<<"NWR"<<endl;
else
{
x=(c-b)/a;
cout << setprecision(2) <<x<< endl;
}
return 0;
}
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