#define MD 998244353
#define M _1
struct M;;
#undef M
using M=Matrix<Mint>;

M segtree_rh_merge(M a,M b){
	return b*a;
}
M segtree_rh_apply(int,M a){
	return a=1;
}
int segtree_rh_compose(int,int){
	return 0;
}

{
	ll@n,@q;
	string@s;
	segtree_rh<M,int>t;
	t.malloc(n);
	t.setN(n,0,0);
	M m0(3,3),m1(3,3);
	m0=1;
	m0[0][1]=1;
	m1=1;
	m1[1][0]=1;
	m1[1][2]=1;
	rep(i,n){
		t[i]=s[i]=='0'?m0:m1;
	}
	t.build();
	rep(q){
		int@y,@l--,@r;
		if(y==1){
			t.change(l,r,0);
		}else{
			M z=t.get(l,r);
			wt(z[0][2]+z[1][2]);
		}
	}
}