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#include<fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int DN=1030;
int n,m,a[2][DN],dp[DN][DN];
void solve(int n,int m)
{
if(n==0||m==0)
return;
if(a[0][n]==a[1][m]&&dp[n-1][m-1]+1==dp[n][m])
{
solve(n-1,m-1);
fout<<a[0][n]<<' ';
return;
}
if(dp[n-1][m]==dp[n][m])
solve(n-1,m);
else
solve(n,m-1);
}
int main()
{
fin>>n>>m;
for(int j=1;j<=n;j++)
fin>>a[0][j];
for(int j=1;j<=m;j++)
fin>>a[1][j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(a[0][i]==a[1][j])
dp[i][j]=max(dp[i][j],dp[i-1][j-1]+1);
}
fout<<dp[n][m]<<'\n';
solve(n,m);
}