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#include<fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],mat[1025][1025],fin[1025],lg,i,j;
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
mat[i][j]=mat[i-1][j-1]+1;
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
i=n;
j=m;
while(i>=1&&j>=1)
{
int val=mat[i][j];
while(mat[i-1][j]==val)
i--;
while(mat[i][j-1]==val)
j--;
lg++;
fin[lg]=a[i];
i--;
j--;
}
lg=mat[n][m];
g<<lg<<"\n";
for(i=lg;i>=1;i--)
g<<fin[i]<<" ";
return 0;
}