public static void main ( String [ ] args ) throws Exception {
  Scanner sc = new Scanner ( System . in ) ;
  String [ ] ary = new String [ 3 ] ;
  for ( int i = 0 ;
  i < 3 ;
  i ++ ) {
    ary [ i ] = sc . next ( ) ;
  }
  System . out . println ( ary [ 0 ] . substring ( 0 , 1 ) + ary [ 1 ] . substring ( 1 , 2 ) + ary [ 2 ] . substring ( 2 , 3 ) ) ;
}

public static void main ( String [ ] args ) throws Exception { Scanner sc = new Scanner ( System . in ) ; String [ ] ary = new String [ 3 ] ; for ( int i = 0 ; i < 3 ; i ++ ) { ary [ i ] = sc . next ( ) ; } System . out . println ( ary [ 0 ] . substring ( 0 , 1 ) + ary [ 1 ] . substring ( 1 , 2 ) + ary [ 2 ] . substring ( 2 , 3 ) ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_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: (array_type element: (type_identifier) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (type_identifier) dimensions: (dimensions_expr (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: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (method_invocation object: (array_access array: (identifier) index: (decimal_integer_literal)) name: (identifier) arguments: (argument_list (decimal_integer_literal) (decimal_integer_literal))) right: (method_invocation object: (array_access array: (identifier) index: (decimal_integer_literal)) name: (identifier) arguments: (argument_list (decimal_integer_literal) (decimal_integer_literal)))) right: (method_invocation object: (array_access array: (identifier) index: (decimal_integer_literal)) name: (identifier) arguments: (argument_list (decimal_integer_literal) (decimal_integer_literal)))))))))