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#include<fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1024],b[1024],sol[1024][1024],n,m;
int maxi(int x,int y)
{
if(x>y) return x;
else return y;
}
void solve()
{
int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
sol[i][j]=sol[i-1][j-1]+1;
else sol[i][j]=maxi(sol[i-1][j],sol[j-1][i]);
}
void afisare(int x,int y,int k)
{
if(k>0)
{
if(a[x]==b[y])
{ afisare(x-1,y-1,k-1);
g<<a[x]<<" ";
}
else if(sol[x-1][y]>sol[x][y-1])afisare(x-1,y,k);
else afisare(y,x-1,k);
}
}
int main()
{
int i;
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
solve();
g<<sol[n][m]+1<<'\n';
afisare(n,m,sol[n][m]+1);
return 0;
}