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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
struct adat
{
int a,h;
};
adat a[1050][1050];
int kiir(adat a[1050][1050],int n,int m,vector<int> x,vector<int> y)
{
if(a[n][m].h!=0)
{
if(a[n][m].h==3)
{
kiir(a,n-1,m-1,x,y);
if(a[n-1][m-1].a<a[n][m].a) fout<<x[n]<<" ";
}
else
{
if(a[n][m].h==2)
{
kiir(a,n-1,m,x,y);
}
else
{
kiir(a,n,m-1,x,y);
}
}
}
}
int main()
{
int n,m,i,j;
fin>>n>>m;
vector<int> x(n+1),y(m+1);
for(i=1;i<=n;i++)
{
fin>>x[i];
}
for(i=1;i<=m;i++)
{
fin>>y[i];
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(x[i]==y[j])
{
a[i][j].a=a[i-1][j-1].a+1;
a[i][j].h=3;
}
else
{
if(a[i][j-1].a>a[i-1][j].a)
{
a[i][j].a=a[i][j-1].a;
a[i][j].h=1;
}
else
{
a[i][j].a=a[i-1][j].a;
a[i][j].h=2;
}
}
}
}
fout<<a[n][m].a<<"\n";
kiir(a,n,m,x,y);
}