func_code_string: #include <bits/stdc++.h>   using namespace std;   int print1() {     cout << -1 << endl;     return 0;   }   int main() {     int n, m;     cin >> n >> m;     vector<vector<int> > e(n);     int a, b;     for (int i = 0; i < m; ++i) {       cin >> a >> b;       a--;       b--;       e[a].push_back(b);       e[b].push_back(a);     }     vector<int> c(n, 0);     vector<int> cnt(3, 0);     cnt[0] = n;     for (auto &v : e[0]) {       c[v] = 2;       cnt[0]--;       cnt[2]++;     }     for (a = 0; a < n && c[a] == 0; ++a)       ;     if (a == n) return print1();     for (auto &v : e[a]) {       if (c[v] == 2) {         c[v] = 1;         cnt[1]++;         cnt[2]--;       }     }     for (int j = 0; j < 3; ++j)       if (cnt[j] == 0) return print1();     vector<int> loc(3, 0);     for (int i = 0; i < n; ++i) {       loc[0] = 0;       loc[1] = 0;       loc[2] = 0;       for (auto &v : e[i]) loc[c[v]]++;       if (loc[c[i]] != 0) return print1();       for (int j = 0; j < 3; ++j)         if (c[i] != j && loc[j] != cnt[j]) return print1();     }     for (int i = 0; i < n; ++i) cout << c[i] + 1 <<    ;     cout << endl;     return 0;   }   