func_code_string: #include <bits/stdc++.h>   using namespace std;       #define send {ios_base::sync_with_stdio(false);}   #define help {cin.tie(NULL);}   #define f first   #define s second   #define pb push_back   #define vi vector<long long>   #define vii vector<pair<long long,long long>>   #define dict unordered_map<long long, long long>   #define contains(d,x) (d.find(x)!=d.end())      typedef long long ll;   typedef long double lld;   typedef unsigned long long ull;      const lld pi = 3.14159265358979323846;   const ll mod = 1000000007;   // const ll mod = 998244353;       ll n, m, k, l, p, q, r, x, y, z, sz;   const ll template_array_size = 1e6 + 5;   ll a[template_array_size];   ll b[template_array_size];   ll c[template_array_size];   string s, t;   ll ans = 0;   ll ts[5000000];      ll power(int x, int y){    if(!y) return 1;    ll temp = power(x, y/2);    temp = (temp*temp)%mod;    if(y&1){     return (temp*x)%mod;    }    return temp;   }      int find(int i, ll rep[]) {    int t = i;    while(rep[i]!=i){     i = rep[i];    }    while(rep[t]!=t){     t = rep[t];     rep[t] = i;    }    return i;   }      int onion(int i, int j, ll rep[]){    i = find(i,rep);    j = find(j,rep);    rep[j] = i;    return i!=j;   }      void solve(int tc = 0) {    cin >> n >> m;    vector<vii> adj(m+1);    vi chosen;    for(int i=0; i<m+1; i++) a[i] = i;    for(int i=0; i<n; i++) {     cin >> x;     if (x==1) {      cin >> y;      x = 0;     } else {      cin >> x >> y;     }     if(onion(x,y,a)){      chosen.pb(i+1);     }    }    p = chosen.size();    ans = power(2,p);    cout << ans <<     << p << endl;    for(int i : chosen) cout << i <<   ;    cout << endl;   }       int main() {           send help       // int tc = 1;    // cin >> tc;    // for (int t = 0; t < tc; t++) solve(t);    solve();   } 