public static void main ( String [ ] args ) {
  String txt = new java . util . Scanner ( System . in ) . next ( ) ;
  int l = txt . length ( ) ;
  int [ ] lpsf = new int [ l ] ;
  LPS ( txt , lpsf ) ;
  int [ ] lpsb = new int [ l ] ;
  LPS ( new StringBuilder ( txt ) . reverse ( ) . toString ( ) , lpsb ) ;
  int max = 0 ;
  for ( int i = 2 ;
  i < l ;
  i ++ ) if ( lpsf [ i - 1 ] > max && lpsf [ i - 1 ] == lpsb [ l - i + lpsf [ i - 1 ] - 1 ] ) max = lpsf [ i - 1 ] ;
  System . out . println ( ( max == 0 ) ? "Just a legend" : txt . substring ( 0 , max ) ) ;
}

public static void main ( String [ ] args ) { String txt = new java . util . Scanner ( System . in ) . next ( ) ; int l = txt . length ( ) ; int [ ] lpsf = new int [ l ] ; LPS ( txt , lpsf ) ; int [ ] lpsb = new int [ l ] ; LPS ( new StringBuilder ( txt ) . reverse ( ) . toString ( ) , lpsb ) ; int max = 0 ; for ( int i = 2 ; i < l ; i ++ ) if ( lpsf [ i - 1 ] > max && lpsf [ i - 1 ] == lpsb [ l - i + lpsf [ i - 1 ] - 1 ] ) max = lpsf [ i - 1 ] ; System . out . println ( ( max == 0 ) ? " Just ▁ a ▁ legend " : txt . substring ( 0 , max ) ) ; }
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