a = '00112233445566778899' num_lis = [int(i) for i in a] if 0 not in set(num_lis) and len(set(num_lis))==9:     print 10 else:     dict1=[0 for i in range(10)]     #num_lis.sort()     for i in num_lis:         dict1[i] = dict1[i]+1     dict1[0]=max(dict1)+1     #print min(dict1),dict1.index(min(dict1))     print int((1+min(dict1))*str(dict1.index(min(dict1))))