#include <bits/stdc++.h>
int main() {
  int upVote, downVote, unknown;
  scanf("%d %d %d", &upVote, &downVote, &unknown);
  if (upVote - downVote == 0 && unknown == 0) {
    printf("0\n");
  } else if (upVote > downVote && (upVote - downVote) > unknown) {
    printf("+\n");
  } else if (downVote > upVote && (downVote - upVote) > unknown) {
    printf("-\n");
  } else {
    printf("?\n");
  }
  return 0;
}
