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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int x[1025],y[1025],c[1025][1025],n,m;
void solve()
{
int i,j;
for (i=1;i<=n;i++)
for (j=1;j<=m;j++)
if (x[i]==y[j]) c[i][j]=c[i-1][j-1]+1;
else c[i][j]=max(c[i][j-1],c[i-1][j]);
}
void afis(int i,int j)
{
if (i>=1 && j>=1)
if (x[i]!=y[j])
if (c[i][j-1]>c[i-1][j]) afis(i,j-1);
else afis(i-1,j);
else {afis(i-1,j-1);
g<<x[i]<<" ";
}
}
int main()
{ int i,j;
f>>n>>m;
for (i=1;i<=n;i++)
f>>x[i];
for (j=1;j<=m;j++)
f>>y[j];
solve();
g<<c[n][m]<<'\n';
afis(n,m);
g.close();
return 0;
}