#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

vector<int> adj[100005];

int main(){
  int n, m;
  cin >> n >> m;
  rep(i,m){
    int a, b;
    cin >> a >> b;
    adj[a].push_back(b);
    adj[b].push_back(a);
  }
  
  vector<int> use(n,-1);
  for(int i=n-1; i>=0; i--){
    if(use[i]==-1){
      bool flg = false;
      rep(j,adj[i].size()){
        if(adj[i][j] > j && use[adj[i][j]] == 0){
          flg = true;
          break;
        }
      }
      if(flg){
        use[i] = 1;
      }else{
        use[i] = 0;
      }
    }
  }

  bool flg = false;
  for(int i=n-1; i>=0; i--){
    if(!flg && use[i]==1){
      flg = true;
    }
    if(flg) cout << use[i];
  }
  cout << endl;
  return 0;
}