#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/rope>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= (a); i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto& a : x)

#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound

#define sz(x) (int)x.size()
#define beg(x) x.begin()
#define en(x) x.end()
#define all(x) beg(x), en(x)
#define resz resize

const int MOD = 1000000007; // 998244353
const ll INF = 1e18;
const int MX = 100005;
const ld PI = 4*atan((ld)1);

template<class T> void ckmin(T &a, T b) { a = min(a, b); }
template<class T> void ckmax(T &a, T b) { a = max(a, b); }

namespace input {
    template<class T> void re(complex<T>& x);
    template<class T1, class T2> void re(pair<T1,T2>& p);
    template<class T> void re(vector<T>& a);
    template<class T, size_t SZ> void re(array<T,SZ>& a);

    template<class T> void re(T& x) { cin >> x; }
    void re(double& x) { string t; re(t); x = stod(t); }
    void re(ld& x) { string t; re(t); x = stold(t); }
    template<class Arg, class... Args> void re(Arg& first, Args&... rest) { 
        re(first); re(rest...); 
    }

    template<class T> void re(complex<T>& x) { T a,b; re(a,b); x = cd(a,b); }
    template<class T1, class T2> void re(pair<T1,T2>& p) { re(p.f,p.s); }
    template<class T> void re(vector<T>& a) { F0R(i,sz(a)) re(a[i]); }
    template<class T, size_t SZ> void re(array<T,SZ>& a) { F0R(i,SZ) re(a[i]); }
}

using namespace input;

namespace output {
    template<class T1, class T2> void pr(const pair<T1,T2>& x);
    template<class T, size_t SZ> void pr(const array<T,SZ>& x);
    template<class T> void pr(const vector<T>& x);
    template<class T> void pr(const set<T>& x);
    template<class T1, class T2> void pr(const map<T1,T2>& x);

    template<class T> void pr(const T& x) { cout << x; }
    template<class Arg, class... Args> void pr(const Arg& first, const Args&... rest) { 
        pr(first); pr(rest...); 
    }

    template<class T1, class T2> void pr(const pair<T1,T2>& x) { 
        pr("{",x.f,", ",x.s,"}"); 
    }
    template<class T> void prContain(const T& x) {
        pr("{");
        bool fst = 1; for (const auto& a: x) pr(!fst?", ":"",a), fst = 0; // const needed for vector<bool>
        pr("}");
    }
    template<class T, size_t SZ> void pr(const array<T,SZ>& x) { prContain(x); }
    template<class T> void pr(const vector<T>& x) { prContain(x); }
    template<class T> void pr(const set<T>& x) { prContain(x); }
    template<class T1, class T2> void pr(const map<T1,T2>& x) { prContain(x); }
    
    void ps() { pr("\n"); }
    template<class Arg> void ps(const Arg& first) { 
        pr(first); ps(); // no space at end of line
    }
    template<class Arg, class... Args> void ps(const Arg& first, const Args&... rest) { 
        pr(first," "); ps(rest...); // print w/ spaces
    }
}

using namespace output;

namespace io {
    void setIn(string s) { freopen(s.c_str(),"r",stdin); }
    void setOut(string s) { freopen(s.c_str(),"w",stdout); }
    void setIO(string s = "") {
        ios_base::sync_with_stdio(0); cin.tie(0); // fast I/O
        if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
    }
}

using namespace io;

template<class T> T invGeneral(T a, T b) {
    a %= b; if (a == 0) return b == 1 ? 0 : -1;
    T x = invGeneral(b,a); 
    return x == -1 ? -1 : ((1-(ll)b*x)/a+b)%b;
}

template<class T> struct modular {
    T val; 
    explicit operator T() const { return val; }
    modular() { val = 0; }
    template<class U> modular(const U& v) {
        val = (-MOD <= v && v <= MOD) ? v : v % MOD;
        if (val < 0) val += MOD;
    }
    friend ostream& operator<<(ostream& os, const modular& a) { return os << a.val; }
    friend bool operator==(const modular& a, const modular& b) { return a.val == b.val; }
    friend bool operator!=(const modular& a, const modular& b) { return !(a == b); }

    modular operator-() const { return modular(-val); }
    modular& operator+=(const modular& m) { if ((val += m.val) >= MOD) val -= MOD; return *this; }
    modular& operator-=(const modular& m) { if ((val -= m.val) < 0) val += MOD; return *this; }
    modular& operator*=(const modular& m) { val = (ll)val*m.val%MOD; return *this; }
    friend modular exp(modular a, ll p) {
        modular ans = 1; for (; p; p /= 2, a *= a) if (p&1) ans *= a;
        return ans;
    }
    friend modular inv(const modular& a) { return invGeneral(a.val,MOD); } 
    // inv is equivalent to return exp(b,b.mod-2) if prime
    modular& operator/=(const modular& m) { return (*this) *= inv(m); }
    
    friend modular operator+(modular a, const modular& b) { return a += b; }
    friend modular operator-(modular a, const modular& b) { return a -= b; }
    friend modular operator*(modular a, const modular& b) { return a *= b; }
    
    friend modular operator/(modular a, const modular& b) { return a /= b; }
};

typedef modular<int> mi;
typedef pair<mi,mi> pmi;
typedef vector<mi> vmi;
typedef vector<pmi> vpmi;


template<int SZ, bool directed> struct Euler {
    int N, M;
    vpi adj[SZ], circuit;
    int out[SZ], in[SZ], deg[SZ];
    bool used[400001], bad;

    void clr() {
        F0R(i,N) adj[i].clear();
        circuit.clear();
        F0R(i,N) out[i] = in[i] = deg[i] = 0;
        F0R(i,M) used[i] = 0;
        N = M = bad = 0;
    }

    void dfs(int pre, int cur) {
        while (sz(adj[cur])) {
            pi x = adj[cur].back(); adj[cur].pop_back();
            if (used[x.s]) continue;
            used[x.s] = 1; dfs(cur,x.f);
        }
        if (sz(circuit) && circuit.back().f != cur) bad = 1;
        circuit.pb({pre,cur}); // generate circuit in reverse order
    }

    void addEdge(int a, int b) {
        if (directed) {
            adj[a].pb({b,M});
            out[a] ++, in[b] ++;
        } else {
            // ps("HA",a,b);
            adj[a].pb({b,M}), adj[b].pb({a,M});
            deg[a] ++, deg[b] ++;
        }
        M ++;
    }

    vi solve(int _N) {
        N = _N; // edges only involve vertices from 0 to N-1

        int start = 0; F0R(i,N) if (deg[i] || in[i] || out[i]) start = i;
        if (directed) {
            F0R(i,N) if (out[i]-in[i] == 1) start = i;
        } else {
            F0R(i,N) if (deg[i]&1) start = i;
        }
        dfs(-1,start);

        if (sz(circuit) != M+1 || bad) return {}; // return empty if no sol
        vi ans; F0Rd(i,sz(circuit)) ans.pb(circuit[i].s);
        return ans;
    }
};

Euler<2*MX,0> E;
int N, A[2][MX], sz[MX], res[MX];
vi child[2][MX];

int main() {
    setIO();
    re(N); 
    F0R(j,2) FOR(i,1,N+1) {
        re(A[j][i]);
        if (A[j][i] != -1) child[j][A[j][i]].pb(i);
    }
    FOR(i,1,N+1) if ((sz(child[0][i])-sz(child[1][i]))%2 != 0) {
        ps("IMPOSSIBLE");
        exit(0);
    }
    ps("POSSIBLE");
    FOR(i,1,N+1) {
        F0R(j,2) {
            if (A[j][i] == -1) {
                E.addEdge(0,i+N*j);
                // ps("WUT",i,j);
            } else E.addEdge(A[j][i]+N*j,i+N*j);
        }
        if (sz(child[0][i])%2 == 0) E.addEdge(i,i+N);
    }
    F0R(i,2*N+1) // ps(i,sz(E.adj[i]));
    assert(sz(E.adj[i])%2 == 0);
    vi v = E.solve(2*N+1);
    F0R(i,sz(v)-1) if (v[i] && v[i+1] && abs(v[i]-v[i+1]) == N) res[min(v[i],v[i+1])] = (v[i] < v[i+1] ? 1 : -1);
    // exit(0);
    // pr(N);
    // pr(N,res[1]);
    FOR(i,1,N+1) pr(res[i],' ');
}


/* stuff you should look for
    * int overflow, array bounds
    * special cases (n=1?), set tle
    * do smth instead of nothing and stay organized
*/

Measured memory_bytes: 37104