#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  int n,m;
  cin>>n>>m;
  vector<vector<int> > G(n);
  for(int i=0;i<m;i++){
    int a,b;
    cin>>a>>b;
    G[a].emplace_back(b);
    G[b].emplace_back(a);
  }
  
  vector<int> used(n);
  for(int i=n-1;i>=0;i--){
    if(used[i]) continue;
    for(int v:G[i]) used[v]=1;
  }
  while(used.size()>1u&&used.back()==0) used.pop_back();
  
  reverse(used.begin(),used.end());
  for(int x:used) cout<<x;
  cout<<endl;
  return 0;
}