public static void main ( String [ ] args ) {
  Scanner scn = new Scanner ( System . in ) ;
  String str = scn . next ( ) ;
  char [ ] s = str . toCharArray ( ) ;
  int [ ] z = zfunction ( s ) ;
  int n = s . length ;
  int maxz = 0 ;
  int res = - 1 ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    if ( z [ i ] == ( n - i ) && maxz >= ( n - i ) ) {
      res = n - i ;
      break ;
    }
    maxz = Math . max ( maxz , z [ i ] ) ;
  }
  if ( res == - 1 ) {
    System . out . println ( "Just a legend" ) ;
  }
  else {
    System . out . println ( str . substring ( 0 , res ) ) ;
  }
}

public static void main ( String [ ] args ) { Scanner scn = new Scanner ( System . in ) ; String str = scn . next ( ) ; char [ ] s = str . toCharArray ( ) ; int [ ] z = zfunction ( s ) ; int n = s . length ; int maxz = 0 ; int res = - 1 ; for ( int i = 1 ; i < n ; i ++ ) { if ( z [ i ] == ( n - i ) && maxz >= ( n - i ) ) { res = n - i ; break ; } maxz = Math . max ( maxz , z [ i ] ) ; } if ( res == - 1 ) { System . out . println ( " Just ▁ a ▁ legend " ) ; } else { System . out . println ( str . substring ( 0 , res ) ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation name: (identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (unary_expression operand: (decimal_integer_literal)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier)))) right: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier)))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (break_statement))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (array_access array: (identifier) index: (identifier)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))))))))))