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#include <fstream>
#define NMAX 1025
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int A[NMAX],B[NMAX],sir[NMAX],D[NMAX][NMAX];
int n,m,i,j,k;
int maxim(int a,int b)
{
if(a>b)
return a;
return b;
}
int main()
{
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])
D[i][j]=1+D[i-1][j-1];
else D[i][j]=maxim(D[i][j-1],D[i-1][j]);
}
}
fout<<D[--i][--j]<<'\n';
while(i)
{
if(A[i]==B[j])
{
sir[k++]=A[i];i--;j--;
} else if(D[i][j-1]>D[i-1][j])
j--;
else i--;
}
for(k=k-1;k>=0;k--)
fout<<sir[k]<<' ';
return 0;
}