#include <bits/stdc++.h>
using namespace std;
int read() {
  int X = 0, p = 1;
  char c = getchar();
  for (; c > '9' || c < '0'; c = getchar())
    if (c == '-') p = -1;
  for (; c >= '0' && c <= '9'; c = getchar()) X = X * 10 + c - '0';
  return X * p;
}
int main() {
  int x = read(), y = read(), z = read();
  if (x + z > y && x > z + y)
    puts("+");
  else if (y + z > x && y > z + x)
    puts("-");
  else if (y + z == x && y == x + z)
    puts("0");
  else
    puts("?");
}
