public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  while ( sc . hasNext ( ) ) {
    int t = sc . nextInt ( ) ;
    while ( t -- > 0 ) {
      int x = sc . nextInt ( ) ;
      int y = sc . nextInt ( ) ;
      System . out . println ( 2 * x > y ? ( ( - 1 ) + " " + ( - 1 ) ) : ( x + " " + x * 2 ) ) ;
    }
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; while ( sc . hasNext ( ) ) { int t = sc . nextInt ( ) ; while ( t -- > 0 ) { int x = sc . nextInt ( ) ; int y = sc . nextInt ( ) ; System . out . println ( 2 * x > y ? ( ( - 1 ) + " ▁ " + ( - 1 ) ) : ( x + " ▁ " + x * 2 ) ) ; } } }
(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)))))) (while_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (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 (ternary_expression condition: (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (identifier)) right: (identifier)) consequence: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (unary_expression operand: (decimal_integer_literal))) right: (string_literal)) right: (parenthesized_expression (unary_expression operand: (decimal_integer_literal))))) alternative: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (string_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))))))))))))