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#include <fstream>
using namespace std;
//c[i][j] primele i elem a lui A si primele j ale lui B
int n,m,i,j,a[1025],b[1025];
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int c[1025][1025];
void tipar(int i,int j)
{
if(i>=1&&j>=1)
{
if(a[i]!=b[j])
{
if(c[i][j-1]>c[i-1][j]) tipar(i,j-1);
else tipar(i-1,j);
}
else {tipar(i-1,j-1);g<<a[i]<<" ";}
}
}
int main()
{
f>>n>>m;
c[0][0]=0;
for(i=1;i<=n;i++)
f>>a[i];
for(j=1;j<=m;j++)
f>>b[j];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j]) c[i][j]=c[i-1][j-1]+1;
else c[i][j]=max(c[i-1][j],c[i][j-1]);
g<<c[n][m]<<endl;
tipar(n,m);
return 0;
}