#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;
using u128 = unsigned __int128;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int N;
    std::cin >> N;
    
    std::vector<int> a(N), b(N), cnta(N), cntb(N);
    for (int i = 0; i < N; i++) {
        std::cin >> a[i];
        a[i]--;
        cnta[a[i]]++;
    }
    for (int i = 0; i < N; i++) {
        std::cin >> b[i];
        b[i]--;
        cntb[b[i]]++;
    }
    
    if (cnta != cntb) {
        std::cout << -1 << "\n";
        return 0;
    }
    
    if (*std::max_element(a.begin(), a.end()) <= 1) {
        auto ar = a;
        std::reverse(ar.begin(), ar.end());
        if (ar == b) {
            std::cout << 1 << "\n";
            for (int i = 0; i < N; i++) {
                std::cout << 1 << " \n"[i == N - 1];
            }
            for (int i = 0; i < N; i++) {
                std::cout << 1 << " \n"[i == N - 1];
            }
        } else {
            std::cout << 2 << "\n";
            for (int i = 0; i < N; i++) {
                std::cout << a[i] + 1 << " \n"[i == N - 1];
            }
            for (int i = 0; i < N; i++) {
                std::cout << b[i] + 1 << " \n"[i == N - 1];
            }
        }
        return 0;
    }
    
    return 0;
}