enum Bit
        {
            A=10,B,C,D,E,F,G,
            H,I,J,K,L,M,N,O,P,
            Q,R,S,T,U,V,W,X,Y,Z,
        }

        static string Jinsu(int n, int Jin)
        {
            int mak = n;
            int namuji;
            string s = string.Empty;
            char[] s1 = new char[s.Length];
            while(mak / Jin != 0)
            {
                namuji = mak % Jin;
                mak /= Jin;
                if(Jin > 9)
                {
                    s += (Bit)namuji;
                }
                else
                    s += namuji;
            }
            s += mak;
            s1 = s.ToCharArray().Reverse().ToArray();
            s = string.Concat(s1);
            return s;
        }