public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int cases = sc . nextInt ( ) ;
  while ( cases > 0 ) {
    long a = sc . nextLong ( ) ;
    long b = sc . nextLong ( ) ;
    if ( a < b ) {
      long temp = a ;
      a = b ;
      b = temp ;
    }
    long val = a / b ;
    if ( a == b ) {
      System . out . println ( 0 ) ;
    }
    else if ( val % 2 != 0 || a % b != 0 ) {
      System . out . println ( - 1 ) ;
    }
    else {
      int count = 0 ;
      a : {
        while ( val > 1 ) {
          if ( val % 8 == 0 ) {
            count ++ ;
            val = val / 8 ;
          }
          else if ( val % 4 == 0 ) {
            val = val / 4 ;
            count ++ ;
          }
          else if ( val % 2 == 0 ) {
            val = val / 2 ;
            count ++ ;
          }
          else {
            break a ;
          }
        }
      }
      if ( val == 1 ) {
        System . out . println ( count ) ;
      }
      else {
        System . out . println ( - 1 ) ;
      }
    }
    cases -- ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int cases = sc . nextInt ( ) ; while ( cases > 0 ) { long a = sc . nextLong ( ) ; long b = sc . nextLong ( ) ; if ( a < b ) { long temp = a ; a = b ; b = temp ; } long val = a / b ; if ( a == b ) { System . out . println ( 0 ) ; } else if ( val % 2 != 0 || a % b != 0 ) { System . out . println ( - 1 ) ; } else { int count = 0 ; a : { while ( val > 1 ) { if ( val % 8 == 0 ) { count ++ ; val = val / 8 ; } else if ( val % 4 == 0 ) { val = val / 4 ; count ++ ; } else if ( val % 2 == 0 ) { val = val / 2 ; count ++ ; } else { break a ; } } } if ( val == 1 ) { System . out . println ( count ) ; } else { System . out . println ( - 1 ) ; } } cases -- ; } }
(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: (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: (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)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (decimal_integer_literal))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (unary_expression operand: (decimal_integer_literal)))))) alternative: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (labeled_statement (identifier) (block (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (update_expression (identifier)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (update_expression (identifier)))) alternative: (block (break_statement (identifier)))))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (unary_expression operand: (decimal_integer_literal)))))))))) (expression_statement (update_expression (identifier)))))))