bool ContainsDuplicates( apstring str )
     {
         int i, j;

         for( i = 0; i < str.length( ); i++ )
         {
             for( j = i + 1; j < str.length( ); j++ )
             {
                 if( str[ i ] == str[ j ] )
                     return true;
             }
         }
         return false;
     }

     int CountChars( apstring source, apstring target )
     {
         int count = 0;
         int t;    
         int s;

         if( ContainsDuplicates( target ) )
             return -1;

         for( t = 0; t < target.length( ); t++ )
         {
             for( s = 0; s < source.length( ); s++ )
             {
                 if( source[ s ] == target[ t ] )
                     count++;
             }
         }

         return count;
     }