#include<bits/stdc++.h>
using namespace std;
int mp[100][100],sx,sy,fx,fy,t = 0,n,m,cx,cy,xe = 6;
bool vist[100][100];
int ax[6]={-1,0,1,0};
int ay[6]={0,1,0,-1};
void mg(int nx,int ny){
	int i;
	xe--;
	t++;
	cout << xe << endl;
	if(mp[nx][ny] == 3)return;

	for(i = 0;i < 4; ++ i){
		int tx,ty;
		tx = nx + ax[i];
		ty = ny + ay[i];
		if(mp[tx][ty] == 0 || vist[tx][ty] == 1)continue;
		if(tx <= 0 || tx > n || ty <= 0 || ty > m)continue;
		if(mp[nx][ny] == 4) xe = 6;
		vist[tx][ty] = 1;	
		if(xe == 0) return;
		mg(tx,ty);
	}
	
}
int main(){
	int i;
	cin >> n >> m;
	for (i = 1;i <= n; ++ i){
		for(int j =1;j <= m; ++ j)
		cin>>mp[i][j];
		
	}
	for (i = 1;i <= n; ++ i){
		for(int j =1;j <= m; ++ j)
		if(mp[i][j] != 0 && vist[i][j] == 0)mg(i,j);
	}
	if(xe > 0)cout << t;
	else cout << -1;
return 0;
}