public static void main ( String [ ] args ) throws Exception {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  int l = sc . nextInt ( ) ;
  int state = 0 ;
  if ( n + m == l ) state += 1 ;
  if ( n - m == l ) state += 2 ;
  String ans = "!" ;
  switch ( state ) {
    case 0 : break ;
    case 1 : ans = "+" ;
    break ;
    case 2 : ans = "-" ;
    break ;
    case 3 : ans = "?" ;
    break ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) throws Exception { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; int l = sc . nextInt ( ) ; int state = 0 ; if ( n + m == l ) state += 1 ; if ( n - m == l ) state += 2 ; String ans = " ! " ; switch ( state ) { case 0 : break ; case 1 : ans = " + " ; break ; case 2 : ans = " - " ; break ; case 3 : ans = " ? " ; break ; } System . out . println ( ans ) ; }
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