result_search = []

for x in '0123456789ABC':

for y in '0123456789ABC':

t = int('8' + x + '78' + y, 13) + int('79' + x + y + '7', 18)

if t % 9 == 0:

result_search.append(t)

if result_search:

print(min(result_search) // 9)

alphabet = sorted('0123456789QWERTYUIOPASDFGHJKLZXCVBNM')

for x in alphabet[:13]:

for y in alphabet[:13]:

A = int(f'8{x}78{y}', 13)

B = int(f'79{x}{y}7', 18)

if (A + B) % 9 == 0:

print((A + B) // 9)

exit()

d='0123456789ABC'

a=[int(f'8{x}78{y}',13)+int(f'79{x}{y}7',18) for x in d for y in d]

print(min([x for x in a if x%9==0])//9)