#ifndef SorahISA
#define SorahISA
#include SorahISA __FILE__ SorahISA
void solve() {
int N, NN; cin >> N, NN = (1 << N);
vector<int> A(NN), inv(NN);
for (int i = 0; i < NN; ++i) cin >> A[i], inv[A[i]] = i;
auto ch1 = [&]() {
for (int i = 0; i < NN/2; ++i) swap(A[i], A[i+NN/2]);
// cerr << "\u001b[34m";
// for (int i = 0; i < NN; ++i) cerr << A[i] << " \n"[i == NN-1];
// cerr << "\u001b[0m";
};
auto ch2 = [&]() {
static vector<int> B(NN);
for (int i = 0; i < NN; i += 2) B[i/2] = A[i];
for (int i = 1; i < NN; i += 2) B[i/2+NN/2] = A[i];
A = B;
// cerr << "\u001b[35m";
// for (int i = 0; i < NN; ++i) cerr << A[i] << " \n"[i == NN-1];
// cerr << "\u001b[0m";
};
int C = inv[0];
string ans = "";
for (int i = 0; i < N; ++i) {
ans += "2", ch2();
if (C >> i & 1) ans += "1", ch1();
}
while (!is_sorted(ALL(A))) {
ans += "2", ch2();
}
cout << 0 << "\n";
cout << ans << "\n";
}
int32_t main() {
fastIO();
int t = 1; // cin >> t;
for (int _ = 1; _ <= t; ++_) {
solve();
}
return 0;
}
#else
#ifdef local
#define _GLIBCXX_DEBUG 1
#endif
#pragma GCC optimize("Ofast", "unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int int64_t
// #define double __float80
using pii = pair<int, int>;
template <typename T> using Prior = std::priority_queue<T>;
template <typename T> using prior = std::priority_queue<T, vector<T>, greater<T>>;
// #define X first
// #define Y second
#define eb emplace_back
#define ef emplace_front
#define ee emplace
#define pb pop_back
#define pf pop_front
#define ALL(x) begin(x), end(x)
#define RALL(x) rbegin(x), rend(x)
#define SZ(x) ((int)(x).size())
#ifdef local
#define fastIO() void()
#define debug(...) \
fprintf(stderr, "%sAt [%s], line %d: (%s) = ", "\u001b[33m", __FUNCTION__, __LINE__, #__VA_ARGS__), \
_do(__VA_ARGS__), fprintf(stderr, "%s", "\u001b[0m")
template <typename T> void _do(T &&_t) {cerr << _t << "\n";}
template <typename T, typename ...U> void _do(T &&_t, U &&..._u) {cerr << _t << ", ", _do(_u...);}
#else
#define fastIO() ios_base::sync_with_stdio(0), cin.tie(0)
#define debug(...) void()
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template <typename T, typename U> bool chmin(T &lhs, U rhs) {return lhs > rhs ? lhs = rhs, 1 : 0;}
template <typename T, typename U> bool chmax(T &lhs, U rhs) {return lhs < rhs ? lhs = rhs, 1 : 0;}
#endif
