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#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int n,m,i,j,a[1030],b[1030],c[1030][1030],sol[1030],vf,d[1030];
void aflsir(int lin, int col)
{
if (a[lin]==b[col])
{
if (d[lin]==0)
{
d[lin]=1;
vf++;
sol[vf]=a[lin];
if (lin==1 || col==1) return;
else aflsir(lin-1,col-1);
}
}
else
{
if (c[lin-1][col]>c[lin][col-1]) aflsir(lin-1,col);
else if (c[lin-1][col]<c[lin][col-1]) aflsir(lin,col-1);
else
{
aflsir(lin-1,col);
aflsir(lin,col-1);
}
}
}
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]) c[i][j]=1+c[i-1][j-1];
else c[i][j]=max(c[i-1][j],c[i][j-1]);
}
}
g<<c[n][m]<<'\n';
aflsir(n,m);
for (i=vf; i>=1; i--) g<<sol[i]<<" ";
return 0;
}