#include <bits/stdc++.h>
using namespace std;
using ll = long long;
void output(bool yes){yes ? cout << "Yes" << "\n" : cout << "No" << "\n";}
vector <int> adj[100005];
vector <int> res(100005);
vector <int> vis(100005);
void find(int i){
vis[i]=true;
for(int j : adj[i]){
res[j]=1;
if(vis[j])continue;
find(j);
}
vis[i]=false;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(0);
int n,m;
cin >> n >> m;
for(int i = 0;i < m;i++){
int u,v;
cin >> u >> v;
u--;
v--;
adj[v].push_back(u);
}
find(0);
if(adj[0].size() == 0)res[0]=1;
for(int i = 0;i < n;i++){
cout << res[i];
}
}
