5.2(d)

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

namespace ConsoleApp1
{
    class Program
    {
        static int Func(int n)
        {
            int k = 0;
            if (n % 2 != 0)
                k++;
            if (n / 10 != 0)
                k += Func(n / 10);
            return k;
        }


        static void Main(string[] args)
        {
            Console.Write("A=");
            int A = int.Parse(Console.ReadLine());
            Console.Write("B=");
            int B = int.Parse(Console.ReadLine());
            for (int n = A + 1;; ++n)
            {
                int m = Func(n);
                if (m == B){
                    Console.WriteLine("{0}", n);
                    break;
                }

            }

        }
    }
}