using System;

public class Program

{

    public static double Distance(int x, int y){

        double sui=0;

        while(x>0&&y>0){

            sui+= Math.Pow(Math.Abs(x%10-y%10),2);

            x = x/10;

            y = y/10;

        }

        sui= Math.Sqrt(sui);

        return sui;

    }

    public static bool IsSame(int firstNum, int secondNum)

    {

        while(firstNum > 9 && secondNum > 9){

            firstNum = firstNum/10;

            secondNum = secondNum/10;

        }

        if(firstNum > 9)

            return false;

        if(secondNum > 9)

            return false;

        return true;

    }

    public static void Main()

    {

        int x,y;

        x= int.Parse(Console.ReadLine());

        y= int.Parse(Console.ReadLine());

        Console.WriteLine(IsSame(x,y));

        if(IsSame(x,y)){

            Console.WriteLine(Distance(x,y));

        }

        else

            Console.WriteLine("-1");

    }

}