cd16ee9
1 2 3 4 5 6 7 8 9 10 11
#!/usr/bin/python3 from sys import argv s = 0 m = [x for x in range(2,9)] for z in argv[1]: x = m.pop() s += x * int(z) k = 11-s%11; if k > 9: k = 0 print(f"{argv[1]}{k}")