#include <bits/stdc++.h>
int main() {
  int a, b, c;
  scanf("%d %d %d", &a, &b, &c);
  int t;
  if (a > b)
    t = a - b;
  else
    t = b - a;
  if (t <= c && c != 0)
    printf("?");
  else {
    if (a > b)
      printf("+");
    else if (a < b)
      printf("-");
    else
      printf("0");
  }
}
