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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int a[1025][1025],i,m,n,x[1025],y[1025],sol[1025];
void cmlsc()
{
int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(x[i]==y[j]) a[i][j]=1+a[i-1][j-1];
else a[i][j]=max(a[i-1][j],a[i][j-1]);
}
void afis()
{
int l=a[n][m];
out<<a[n][m]<<'\n';
int i=n,j=m;
while(l)
{
if(x[i]==y[j])
{
sol[l]=x[i];
l--;
i--;
j--;
}
else
{
if(a[i-1][j]<a[i][j-1]) j--;
else i--;
}
}
for(int k=1;k<=a[n][m];k++)
out<<sol[k]<<" ";
}
int main()
{
in>>n>>m;
for(i=1;i<=n;i++) in>>x[i];
for(i=1;i<=m;i++) in>>y[i];
a[0][0]=0;
cmlsc();
afis();
return 0;
}