import itertools

N = int(input())
A = list(map(int, input().split()))

A = sorted(A)
if N % 2:
	X = 0
	Y = 0
	for i in range(N // 2 + 1):
		X *= 10
		X += A[i]
	for i in range(N // 2):
		Y *= 10
		Y += A[(N // 2 + 1) + i]
	print(X - Y)
else:
	B = [0] * 10
	for i in range(N):
		B[A[i]] += 1
	C = []
	for x in range(10):
		if B[x] % 2:
			C.append(x)
	M = len(C)
	
	ans = 1001001001001
	for p in itertools.permutations(range(M)):
		p1 = p[0: M // 2]
		p2 = p[M // 2: M]
		X = 0
		Y = 0
		for i in p1:
			X *= 10
			X += C[i]
		for i in p2:
			Y *= 10
			Y += C[i]
		ans = min(ans, abs(X - Y))
				
	print(ans)