num = 7777 ** 290 - 777 ** 29 + 77 ** 2 - 7
num_20 = ''
while num > 0:
num_20 += str(num % 20)
num //= 20
num_20 = num_20[::-1]
print(len(set(num_20)))
x=7777**290-777**29+77**2-7;f=lambda n:f(n//20)+"0123456789ABCDEFGHIJ"[n%20]if n else"";print(len(set(f(x))))
"0123456789ABCDEFGHIJ"[n%20]