#include <stdio.h>
#include <string.h>

int main()
{
  char buf[ 7 ];
  int id = 0;

  printf( "Modulo-10-Verfahren\n" );

  while ( 1 )
  {
    do
    {
      printf( "Kundennummer eingeben (max. 8 Stellen): " );
      scanf( "%s", buf );
    }
    while ( !sscanf( buf, "%d", &id ) || strlen( buf ) > 8 );

    if ( id == 0 )
    {
      break;
    }

    int i = 2, k;
    for ( k = strlen( buf ); k > 0; k-- )
    {
      printf( "%d: %d\n", i, buf[ k - 1 ] );
      i++;
    }

    int result = 0;
    printf( "%d", result );
  }

  return 0;
}