#!/usr/bin/env python
import random
temp = ""
for i in range(6) :
num = random.randrange(0, 4)
if num == 3 or num == 1 :
rad2 = random.randrange(0, 10)
temp = temp + str(rad2)
else :
rad1 = random.randrange(65, 91)
c1 = chr(rad1)
temp = temp + c1
print(temp)