import sys
input = sys.stdin.readline
sys.set_int_max_str_digits(10**9)
mod=998244353

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

A=list(map(str,A))

B=[]
for s in A:
    X=list(s)
    while len(X)<20:
        X+=list(s)
    B.append((X,list(s)))

B.sort()

X=[]
for _,s in B:
    X+=s

x="".join(X)


print(int(x)%mod)