[b]var num: array['1'..'9'] of integer;
    c: char;
    count: integer;
begin
     for c:='1' to'9' do num [c]:= 0;
     repeat
       read(c);
       if ('1'<= c) and (c <= '9') then
         num[c]:=1;
     until c = '.';
     count := 0;
     for c:='1' to'9' do begin
       if num [c]=0 then write(c)
       else count:= count + 1;
     end;
     if count = 9then writeln('0');
end.[/b]

using System;

       class Program
       {
           private static bool isDigit(char ch)
           {
               string[] digits = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
               bool result = false;
                  
               for (int i = 0; i < 9; i++)
               {
                   if (ch.ToString() == digits[i])
                   {
                       Console.WriteLine(ch.ToString());
                       result = true;
                       break;
                   }
               }
               return result;
           }
           static void Main(string[] args)
           {
               string x = Console.ReadLine();
               int[] mass = new int[10];
               for (int i = 0; i < x.Length; i++)
               {
                   if (isDigit(x[i]))
                   {
                       mass[Convert.ToInt32(x[i].ToString())] = 1;
                          
                   }
               }
                 
               string result = null ;
               for (int i = 1; i < 10; i++)
               {
                   if (mass [i]== 0)
                   {
                       result += i;

                   }
               }
               Console.WriteLine(result); Console.ReadKey();
           }
       }