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#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1026],b[1026],dp[1026][1026];
int main()
{
fin>>m>>n;
for(int i=1;i<=m;i++)
fin>>a[i];
for(int j=1;j<=n;j++)
fin>>b[j];
for(int i=1;i<=m;i++)
for(int j=1;j<=n;j++)
{
if(a[i]==b[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
fout<<dp[m][n]<<'\n';
/* for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
fout<<dp[i][j]<<" ";
fout<<endl;
} */
int i=m;
int j=n;
int sol[1026];
int x=0;
while(dp[i][j])
{
while(dp[i][j]==dp[i-1][j])
i--;
while(dp[i][j]==dp[i][j-1])
j--;
x++;
sol[x]=b[j];
i--;
}
for(i=x;i>=1;i--)
fout<<sol[i]<<" ";
}