thelist = [1,2,3,4,5,6,7,8,9,8,7,7,6,5,3,2,1,0]
 thelist.insert(0, len(thelist))
 datasize = thelist[0]
 i=j=1;
 while j <= (datasize-1):
 	if thelist[j] == thelist[j+1]:
             j+=1
             continue
 	if i==j:
             i+=1
             j+=1
             continue
 	thelist[i]=thelist[j]
 	i+=1
         j+=1