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function [ str ] = mult_array(a,b)     
   str = 0;    
   c = 0;
   for z1 = 1:numel(a)+numel(b)
      c = floor(c/10);
      for z2 = 1:z1
         if z2 <= numel(a) && z1-z2+1 <= numel(b)
            c = c + a(end-z2+1)*b(end-(z1-z2+1)+1);
         end
      end
      str(1) = mod(c,10);
      str(2:end+1) = str(1:end);
   end
   str(1:end-1) = str(2:end);
   str(end) = [];
end