MOD = 998244353
W,H = map(int,input().split())
P = [-1] * W

def root(x):
    if P[x] < 0: return x
    P[x] = root(P[x])  # 経路圧縮
    return P[x]

def unite(x,y):
    x = root(x)
    y = root(y)
    if x == y: return
    if x > y: x,y = y,x
    P[x] += P[y]
    P[y] = x
    if y in code and x not in code:
        code[x] = code[y]
        code.pop(y)
    elif x in code and y in code:
        if code[x] == code[y]:
            code.pop(y)
        else:
            return False
    return True

def same(x,y):
    return root(x) == root(y)

from collections import defaultdict

code = {}
flag = 1

for h in range(H):
    if flag == 0:
        print(0)
        continue
    S = input()
    dic = defaultdict(list)
    for i in range(W):
        ri = root(i)
        s = S[i]
        x = ord(s)
        if 48 <= x <= 57:
            x -= 48
            if ri in code:
                if code[ri] != x:
                    flag = 0
                    print(0)
                    break
            else:
                code[ri] = x
        if 97 <= x <= 122:
            dic[s].append(i)

    #print(i,P,code,flag)


    if flag == 1:
        for _,V in dic.items():
            if len(V) > 1:
                v0 = V[0]
                for v in V[1:]:
                    if unite(v0,v) == False:
                        flag = 0
                        print(0)
                        break
            if flag == 0:
                break

    if flag == 1:
        cnt = 0
        ans = 1
        for i in range(W):
            if P[i] < 0 and i not in code:
                cnt += 1
        print(pow(10,cnt,MOD))