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#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    int N;
    cin>>N;
    int h[3000];
    for(int i=0; i<N; ++i) cin>>h[i];
    vector< pair<int,int> > V;
    for(int i=0; i<N; ++i) {
        V.push_back(make_pair(h[i],i));
    }
    sort(V.begin(),V.end());
    vector< vector<int> > P;
    bool cz[3000],czy1;
    czy1 = true;
    for(int i=0; i<N; ++i) cz[i] = true;
    for(int i=0; i<N; ++i) {
        vector<int> C;
        if(cz[i]) {
            int M;
            M = V[i].second;
            C.push_back(i);
            while(M != i) {
                C.push_back(M);
                cz[M] = false;
                M = V[M].second;
                
            }
            cz[i] = false;
            if(C.size() > 1) P.push_back(C);
            if(C.size() > 2) czy1 = false;
        }
    }
    vector<int> L1,L2,P1,P2;
    for(int i=0; i<P.size(); ++i) {
        int R = P[i].size();
        for(int j=0; j<R/2; ++j) {
            L1.push_back(P[i][j]);
            P1.push_back(P[i][R-1-j]);
        }
        for(int j=1; j<(R+1)/2; ++j) {
            L2.push_back(P[i][j]);
            P2.push_back(P[i][R-j]);
        }
    }
    if(P.size() == 0) { cout<<0; }
    else if(czy1) {
        cout<<1<<endl;
        cout<<L1.size()+P1.size()<<endl;
        for(int i=0; i<L1.size(); ++i) cout<<L1[i]+1<<" ";
        for(int i=0; i<P1.size(); ++i) cout<<P1[P1.size()-1-i]+1<<" ";
    }
    else {
        cout<<2<<endl;
        cout<<L2.size()+P2.size()<<endl;
        for(int i=0; i<L2.size(); ++i) cout<<L2[i]+1<<" ";
        for(int i=0; i<P2.size(); ++i) cout<<P2[P2.size()-1-i]+1<<" ";
        cout<<endl;
        cout<<L1.size()+P1.size()<<endl;
        for(int i=0; i<L1.size(); ++i) cout<<L1[i]+1<<" ";
        for(int i=0; i<P1.size(); ++i) cout<<P1[P1.size()-1-i]+1<<" ";
    }
    cout<<endl;
    
    
    return 0;
}