# include <iostream.h>
 # include <fstream.h>
 # include <string.h>
 # include <stdlib.h>
 # include <conio.h>
 # include <ctype.h>

 int main( )
    {
       clrscr( );

       fstream File("CP-07.txt",ios::in|ios::nocreate);

       if(!File)
      {
         cout<<"Unable to open the input file."<<endl;
         cout<<"Press any key to exit."<<endl;

         getch( );
         exit(EXIT_FAILURE);
      }

       char Data[100]={NULL};

       do
      {
         strset(Data,NULL);

         File.getline(Data,80,'\n');

         if(strcmpi(Data,"0")==0)
        break;

         int flag=0;
         int name_length=strlen(Data);

         int code_array[100]={0};

         for(int count_1=0;count_1<name_length;count_1++)
        {
           if(!isalpha(Data[count_1]))
              {
             flag=1;

             break;
              }

           else
              {
             Data[count_1]=toupper(Data[count_1]);

             code_array[count_1]=(int(Data[count_1])-64);
              }
        }

         if(!flag)
        {
           int lucky_number=0;

           for(int count_2=0;count_2<name_length;count_2++)
              lucky_number+=code_array[count_2];

           char Lucky_number[100]={NULL};

           while(lucky_number>9)
              {
             strset(Lucky_number,NULL);
             itoa(lucky_number,Lucky_number,10);

             lucky_number=0;

             int number_length=strlen(Lucky_number);

             char Digit[5]={NULL};

             for(int count_3=0;count_3<number_length;count_3++)
                {
                   Digit[0]=Lucky_number[count_3];

                   lucky_number+=atoi(Digit);
                }
              }

           cout<<lucky_number<<endl;
        }

         else
        cout<<"invalid"<<endl;
      }
       while(1);

       File.close( );

       getch( );
       return 0;
    }