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#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;
#define pb push_back
int c[1027][1027],n,m,x,maxi=0;
vector <int> a;
vector <int> b;
vector <int> sol;
void citire()
{
scanf("%d%d",&n,&m);
for(int i=0;i<n;i++)
{
scanf("%d",&x);
a.pb(x);
}
for(int i=0;i<m;i++)
{
scanf("%d",&x);
b.pb(x);
}
}
void afis()
{
printf("%d\n",sol.size());
for(int i=sol.size()-1;i>=0;i--)
printf("%d ",sol[i]);
}
void rev()
{
int q=c[n][m],i=n,j=m;
while(q!=0)
{
if(a[i-1]==b[j-1])
{
sol.pb(a[i-1]);
i-=1;
j-=1;
}
else
{
if(c[i-1][j]>=c[i][j-1])
i-=1;
else j-=1;
}
q=c[i][j];
}
}
void rezolvare()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i-1]==b[j-1])
c[i][j]=max(c[i-1][j],c[i][j-1])+1;
else c[i][j]=max(c[i-1][j],c[i][j-1]);
rev();
}
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
citire();
rezolvare();
afis();
return 0;
}