#include <bits/stdc++.h>
using namespace std;


const int maxn = 10010;

int col[maxn];
int from[maxn], to[maxn];
vector<pair<int, int>> graph[maxn];

int main() {
    ios_base::sync_with_stdio(0), cin.tie(0);
    #ifdef LOCAL
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif // LOCAL

    int n, m; cin >> n >> m;
    for (int i=0; i<m; ++i) {
        cin >> from[i] >> to[i];
        from[i]--;
        to[i]--;

        graph[from[i]].push_back({to[i], i});
        graph[to[i]].push_back({from[i], i});
    }

    for (int i=0; i<2*n; ++i) col[i] = -1;

    vector<int> cnt = {0, 0};
    for (int i = m-1; i>=0; --i) {
        int u = from[i], v = to[i];

        if(col[u] == -1 && col[v] == -1) {
            int c10 = -1, c01 = -1;

            for (auto& p : graph[u]) {
                int w = p.first, k = p.second;

                if (col[w] == 1) c10 = max(c10, k);
                if (col[w] == 0) c01 = max(c01, k);
            }

            for (auto& p : graph[v]) {
                int w = p.first, k = p.second;

                if (col[w] == 1) c01 = max(c01, k);
                if (col[w] == 0) c10 = max(c10, k);
            }

            if (c10 <= c01) col[u] = 1, col[v] = 0;
            else col[u] = 0, col[v] = 1;

            cnt[0]++;
            cnt[1]++;

        } else if (col[u] == -1) {
            if (cnt[1 - col[v]] < n) col[u] = 1 - col[v];
            else  col[u] = col[v];

            cnt[col[u]]++;
        } else if (col[v] == -1) {
            if (cnt[1 - col[u]] < n) col[v] = 1 - col[u];
            else col[v] = col[u];

            cnt[col[v]]++;
        }
    }

    for (int i=0; i<2*n; ++i) cout << col[i];
    cout << endl;
    return 0;
}