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

int main() {

    int lengthOfSubsequence = 0;
    cin >> lengthOfSubsequence;

    int temp;
    vector<int> firstSubSequence, secondSubSequence;

    firstSubSequence.push_back(0);
    secondSubSequence.push_back(0);

    for (int i = 0; i < lengthOfSubsequence; i++) {
        cin >> temp;
        firstSubSequence.push_back(temp);
    }

    for (int i = 0; i < lengthOfSubsequence; i++) {
        cin >> temp;
        secondSubSequence.push_back(temp);
    }


    int dp[lengthOfSubsequence + 1][lengthOfSubsequence + 1];

    for (int i = 0; i <= lengthOfSubsequence; i++) {
        for (int j = 0; j <= lengthOfSubsequence; j++) {
            dp[i][j] = 0;
        }
    }


    for (int i = 1; i <= lengthOfSubsequence; i++) {
        for (int j = 1; j <= lengthOfSubsequence; j++) {
            if (firstSubSequence[i] == secondSubSequence[j]) {
                dp[i][j] = dp[i - 1][j - 1] + 1;
            } else {
                dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
            }
        }
    }

    int i = lengthOfSubsequence, j = lengthOfSubsequence;
    vector<int> firstSubSequenceAns, secondSubSequenceAns, myLCS;

    while (i >= 1 && j >= 1){
        if (firstSubSequence[i] == secondSubSequence[j]){
            firstSubSequenceAns.push_back(i - 1);
            secondSubSequenceAns.push_back(j - 1);
            myLCS.push_back(firstSubSequence[i]);
            i -= 1;
            j -= 1;
        } else if (dp[i - 1][j] == dp[i][j]) {
            i -= 1;
        } else {
            j-=1;
        }
    }

    int sizeOfLCS = dp[lengthOfSubsequence][lengthOfSubsequence];
    cout << sizeOfLCS << endl;


//    for(int i = 0; i < lengthOfSubsequence + 1; i++){
//        for(int j = 0; j < lengthOfSubsequence + 1; j++){
//            cout << dp[i][j] << " ";
//        }
//        cout << endl;
//    }
//    cout << endl;


    for (int i = sizeOfLCS - 1 ; i >= 0; i--) {
        cout <<  firstSubSequenceAns[i]<< " ";
    }
    cout << endl;
    for (int i = sizeOfLCS - 1 ; i >= 0; i--) {
        cout << secondSubSequenceAns[i] << " ";
    }
    cout << endl;

    return 0;
}