using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace cifre001
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = 0, b = 0, k = 0, p = 0, c = 0;
            a = int.Parse(Console.ReadLine());
            b = int.Parse(Console.ReadLine());
            int auxa = a, auxb = b;
            while(a!=0)
            {
                p++;
                a /= 10;
            }
            while(b!=0)
            {
                k++;
                b /= 10;
            }
            if (p != k)
                Console.WriteLine("NU");
            else
            {
                Console.WriteLine("DA");
            }
            while (auxa != 0 && auxb != 0)
            {
                if (auxa % 10 == auxb % 10)
                    c++;
                auxa /= 10;
                auxb /= 10;
            }
                Console.ReadKey();
            Console.WriteLine(c);
            Console.ReadKey();



        }
    }
}