#include <iostream>
#include <math.h>
using namespace std;
float a, b, c, x;
int main()
{
cin >> a >> b >> c;
if ((a==0)&&((c-b)!=0)) {cout<<"BR"<<endl;}
else if ((c-b)==0) {cout<<"NWR"<<endl;}
else
{
x=(c-b)/a;
cout << round(x*100)/100 << endl;
}
return 0;
}
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