x, y, z = (int(i) for i in input().split())
res = "0" if z == 0 and x == y else "?" if z >= abs(x - y) else "+" if x > y else "-"
print(res)
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main ()
{
int a,b,c;
cin>>a>>b>>c;
if (a==b && c!=0)
{
cout<<'?'<<endl;
}
else if (a==b && c==0)
{
cout<<0<<endl;
}
else if (a>b && b+c<a)
{
cout<<"+"<<endl;
}
else if (b>a && a+c<b)
{
cout<<"-\n";
}
else
cout<<"?\n";
}
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