public static void main ( String [ ] args ) {
  FastIO io = FastIO . create ( ) ;
  String prefix = io . nextLine ( ) ;
  String bestMatch = null ;
  int n = io . nextInt ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String candidate = io . nextLine ( ) ;
    if ( candidate . startsWith ( prefix ) ) {
      if ( bestMatch == null || candidate . compareTo ( bestMatch ) < 1 ) {
        bestMatch = candidate ;
      }
    }
  }
  if ( bestMatch == null ) {
    bestMatch = prefix ;
  }
  io . println ( bestMatch ) ;
  io . close ( ) ;
}

public static void main ( String [ ] args ) { FastIO io = FastIO . create ( ) ; String prefix = io . nextLine ( ) ; String bestMatch = null ; int n = io . nextInt ( ) ; for ( int i = 0 ; i < n ; i ++ ) { String candidate = io . nextLine ( ) ; if ( candidate . startsWith ( prefix ) ) { if ( bestMatch == null || candidate . compareTo ( bestMatch ) < 1 ) { bestMatch = candidate ; } } } if ( bestMatch == null ) { bestMatch = prefix ; } io . println ( bestMatch ) ; io . close ( ) ; }
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