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#include <iostream>
#include <bits/stdc++.h>
#define VMAX 1100
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int numere[2][VMAX];
int dp[VMAX][VMAX];
vector<int> solutie;
int main()
{
int n,m,i,j,k,t,q,nr,minim,maxim;
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>numere[0][i];
for(i=1;i<=m;i++)
fin>>numere[1][i];
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(numere[0][i]==numere[1][j])
dp[i][j]=max(dp[i][j],1+dp[i-1][j-1]);
}
}
fout<<dp[n][m]<<'\n';
i=n;
j=m;
while(dp[i][j])
{
if(dp[i][j]==dp[i-1][j])
i--;
else if(dp[i][j]==dp[i][j-1])
j--;
else
{
solutie.push_back(numere[0][i]);
i--;
j--;
}
}
while(!solutie.empty())
{
fout<<solutie.back()<<' ';
solutie.pop_back();
}
return 0;
}