n = int(input())
count = 0
ans = ""
m = n

while m // 1000 > 0:
	m = m // 1000
	count += 1
	

c = count

for i in range(count+1):
	if i == 0:
		m = n // pow(1000,c)
		ans += str(m) + ","
		n -= m * pow(1000,c)
		c -= 1
	elif c > 0:
		m = n // pow(1000,c)
		n -= m * pow(1000,c)
		m = str(m)
		while len(str(m)) < 3:
			m += "0"
		ans += str(m) + ","
		c -= 1
	else:
		n = str(n)
		print(len(n))
		while len(n) < 3:
			n += "0"
		ans += n[-3:]

print(ans)