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#include <fstream>
using namespace std;
ifstream f("date.in");
ofstream g("date.out");
int n,a[100],b[100],v[100][100],m;
void recons(int i,int j)
{
if(v[i][j]!=0)
if(v[i][j]==v[i-1][j-1]+1)
{
recons(i-1,j-1);
g<<a[i]<<" ";
}
else if(v[i][j]==v[i-1][j])
recons(i-1,j);
else if(v[i][j]==v[i][j-1])
recons(i,j-1);
}
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])
v[i][j]=1+v[i-1][j-1];
else
v[i][j]=max(v[i][j-1],v[i-1][j]);
}
g<<v[n][m]<<'\n';
recons(n,m);
return 0;
}