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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int A[102][102],B[1025],C[1025];
void afisare(int n,int m)
{
if(m!=0&&n!=0)
{
if(B[n]==C[m])
{
afisare(n-1,m-1);
fout<<B[n]<<" ";
}
else
if(A[n-1][m]>A[n][m-1])
afisare(n-1,m);
else
afisare(n,m-1);
}
}
int main()
{
int i,j,m,n;
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>B[i];
for(i=1;i<=m;i++)
fin>>C[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(B[i]==C[j])
{
A[i][j]=A[i-1][j-1]+1;
}
else
if(A[i-1][j]>A[i][j-1])
A[i][j]=A[i-1][j];
else
A[i][j]=A[i][j-1];
}
fout<<A[n][m]<<"\n";
afisare(n,m);
return 0;
}