MOD = 998244353
N = int(input())
A = list(map(int, input().split()))
B = []

for i in range(N):
    sA = str(A[i])
    S = []
    for j in range(20):
        if len(sA) <= j:
            S.append(S[-1])
        else:
            S.append(sA[j])
    B.append(("".join(S), -len(sA), i))

B.sort()

x = 0
for i in range(N):
    idx = B[i][-1]
    x = pow(10, len(str(A[idx]))) * x + A[idx]
    x %= MOD

print(x)
# print(B)