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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int dp[1030][1030], m, n, s1[1030], s2[1030], rez[1030], cont=1;
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>s1[i];
for(int i=1;i<=m;i++)
fin>>s2[i];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
dp[i][j]=max(dp[i-1][j-1],max(dp[i-1][j],dp[i][j-1]));
if(s1[i]==s2[j])
{
dp[i-1][j-1]++;
rez[cont]=s1[i];
cont++;
}
}
}
fout<<dp[n][m]<<'\n';
for(int i=1;i<cont;i++)
fout<<rez[i]<<" ";
return 0;
}