#include <bits/stdc++.h>
int main() {
  long long x, y, z;
  scanf("%lld%lld%lld", &x, &y, &z);
  int a = y + z;
  int b = x + z;
  if (a < x && b > y)
    printf("+\n");
  else if (a == x && b == y)
    printf("0\n");
  else if (a > x && b < y)
    printf("-\n");
  else
    printf("?\n");
}
