import sys
sys.set_int_max_str_digits(0)
input = sys.stdin.readline
MOD = 998244353
N = int(input())
C = list(map(int, input().split()))
if N%2==0:
    cnt = [0 for _ in range(10)]
    for c in C:
        cnt[c] = 1 - cnt[c]
    tmp = []
    for i in range(10):
        if cnt[i]==1:
            tmp.append(i)
    if len(tmp)==0:
        print(0)
    else:
        L = len(tmp)
        ans = None
        for i in range(len(tmp)-1):
            X = []
            Y = []
            X.append(str(tmp[i+1]))
            Y.append(str(tmp[i]))
            k = L//2-1
            for j in range(len(tmp)):
                if j==i or j==i+1:
                    continue
                X.append(str(tmp[j]))
                k-=1
                if k==0:
                    break
            k = L//2-1
            for j in range(len(tmp)-1, -1, -1):
                if j==i or j==i+1:
                    continue
                Y.append(str(tmp[j]))
                k-=1
                if k==0:
                    break
            if ans is None:
                ans = int("".join(X))-int("".join(Y))
            else:
                ans = min(ans, int("".join(X))-int("".join(Y)))
        print(ans)

else:
    C.sort()
    X = []
    for i in range(N//2+1):
        X.append(str(C[i]))
    Y = []
    for i in range(N//2):
        Y.append(str(C[N-1-i]))
    ans = int("".join(X))-int("".join(Y))
    print(ans)