#define MD 998244353
ll@w,@h;
unionFind u('m',w,1);
Mint z=Mint(10)**w;
ll b[w];
rep(j,w)b[j]=1023;
rep(h){
	string@q;
	ll a[26]{};
	rep(j,w){
		ll c=q[j];
		ll k=u(j);
		if(c>='0'&&c<='9'){
			c-='0';
			if(b[k]!=1<<c){
				z/=BIT_popcount(b[k]);
				b[k]&=1<<c;
				z*=BIT_popcount(b[k]);
			}
		}
		if(c>='a'&&c<='z'){
			c-='a';
			if(a[c]){
				ll d=u(a[c]-1);
				if(u(d,k)){
					z/=BIT_popcount(b[d]);
					if(b[d]!=b[k]){
						z/=BIT_popcount(b[k]);
						b[u(d)]=b[d]&b[k];
						z*=BIT_popcount(b[u(d)]);
					}
				}
			}else{
				a[c]=k+1;
			}
		}
	}
	wt(z);
}