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#include <iostream>
#include <fstream>
using namespace std;
int n,m,i,j,A[1024],B[1024],M[1024][1024],MAX,sir[1024],c;
int nrmax(int a,int b)
{
if(a>b)
return a;
else return b;
}
int main()
{
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>A[i];
for(i=1;i<=m;i++)
fin>>B[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(A[i]==B[j])
M[i][j]=1+M[i-1][j-1];
else M[i][j] = nrmax(M[i-1][j],M[i][j-1]);
for(i=n,j=m;i; )
{
if(A[i]==B[j])
{
sir[c++]=A[i];
i--; j--;
}
else if(M[i][j-1]>M[i-1][j])
j--;
else
i--;
}
fout<<M[n][m]<<'\n';
for(i=c-1;i>=0;i--)
fout<<sir[i]<<' ';
return 0;
}