import itertools
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
    tmp = []
    for i in range(10):
        if cnt[i]%2==1:
            tmp.append(i)
    assert(len(tmp)%2==0)
    if len(tmp)==0:
        print(0)
    else:
        L = len(tmp)
        ans = float('inf')
        for l in itertools.permutations(tmp):
            X = []
            for i in range(L//2):
                X.append(str(l[i]))
            Y = []
            for i in range(L//2, L):
                Y.append(str(l[i]))
            ans = min(ans, abs( int("".join(X)) - int("".join(Y)) ))
        for j in range(10):
            if cnt[j]%2!=0 or cnt[j]==0:
                continue
            for l in itertools.permutations(tmp+[j, j]):
                X = []
                for i in range((L+2)//2):
                    X.append(str(l[i]))
                Y = []
                for i in range((L+2)//2, L+2):
                    Y.append(str(l[i]))
                ans = min(ans, abs( int("".join(X)) - int("".join(Y)) ))
        print(ans%MOD)

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))
    assert(ans>=0)
    print(ans%MOD)