#include <bits/stdc++.h> using namespace std; int sum[114514][2]; int ax,ay,bx,by,k,pd; int cx[4]={0,-1,0,1}; int cy[4]={-1,0,1,0}; bool temp[117][117]; int mp[117][117]; void print() { if(pd==0) { pd=1; } for(int h=0;h<=k-1;h++) { cout<<sum[h][0]<<" " << sum[h][1] << endl; } cout<<bx<<" " <<by<<endl; } void walk(int x,int y) { if(x==bx&&y==by) { print(); exit(0); } else { for(int i=0;i<=3;i++) if(mp[x+cx[i]][y+cy[i]]==1&&temp[x+cx[i]][y+cy[i]]==0) { temp[x][y]=1; sum[k][0]=x; sum[k][1]=y; k++; walk(x+cx[i],y+cy[i]); temp[x][y]=0; k--; } } } int main() { int m,n; cin>>m>>n; for(int i=1;i<=m;i++) for(int j=1;j<=n;j++) { cin>>mp[i][j]; mp[i][j]=1-mp[i][j]; } // cin>>ax>>ay; // cin>>bx>>by; ax = ay = 1; bx = m,by=n; walk(ax,ay); if(pd==0) cout<<"-1"; return 0; }