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#include <fstream>
using namespace std;
ofstream out("cmlsc.out");
int n,m,a[1025],b[1025],i,v[1025][1025],j,sum,t;
void afiseaza_solutie_max(int i,int j)
{
if(v[i][j])
if(a[i]==b[j])
{
sum++;
afiseaza_solutie_max(i-1,j-1);
if(!t)
{
out<<sum<<'\n';
t++;
}
out<<a[i]<<' ';
}
else
{
if (v[i][j]==v[i-1][j])
afiseaza_solutie_max(i-1,j);
else if (v[i][j]==v[i][j-1])
afiseaza_solutie_max(i,j-1);
}
}
int main()
{
freopen("cmlsc.in","r",stdin);
scanf("%d%d",&n,&m);
for(i = 1 ; i <= n ; i++)
scanf("%d",&a[i]);
for(i = 1 ; i <= m ; i++)
scanf("%d",&b[i]);
for(i = 1 ; i <= n ; i++)
for(j = 1 ; j <= m ; j++)
{
if(a[i]==b[j])
{
sum++;
v[i][j]=sum;
}
else
if (v[i-1][j]>v[i][j-1])
v[i][j]=v[i-1][j];
else v[i][j]=v[i][j-1];
}
sum=0;
afiseaza_solutie_max(n,m);
return 0;
}