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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int v1[1025],v2[1025],d[1025][1025],n,m,i,j,k,sol[1025];
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>v1[i];
for(i=1;i<=m;i++)
f>>v2[i];
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(v1[i]==v2[j])
{
d[i][j]=d[i-1][j-1]+1;
}
else
{
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
}
}
i=n;
j=m;
while(i!=1||j!=1)
{
if(v1[i]==v2[j])
{
sol[++k]=v1[i];
if(i!=1)
i--;
if(j!=1)
j--;
}
else
{
if(d[i-1][j]==d[i][j]&&i!=1) i--;
else j--;
}
}
if(v1[1]==v2[1])
sol[++k]=v1[1];
g<<d[n][m]<<'\n';
for(i=k;i>=1;i--)
g<<sol[i]<<" ";
return 0;
}