#define MD 998244353
ll@n,@m,b=0,o=7;Mint z=1;rep(y,n)rep(x,m){char@c,k=1<<(x+y)%3;z*=c<64?o&k?!(o^=k)+1:2:c<87?b^=k,1:1;}wt(z*!(o&b&&o&~b));