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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],D[1025][1025],sir[1025],r;
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
f>>a[i];
for(int i=1;i<=m;i++)
f>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
D[i][j]=1+D[i-1][j-1];
else
D[i][j]=max(D[i-1][j],D[i][j-1]);
for(int i=n,j=m; i&&j; )
if(a[i]==b[j])
sir[++r]=a[i],i--,j--;
else if(D[i-1][j]<D[i][j-1])
j--;
else
i--;
g<<r<<'\n';
for(int i=r;i>=1;i--)
g<<sir[i]<<" ";
return 0;
}