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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m,n,i,j,x[1030],y[1030],c[1030][1030],b[1030],nr;
int main()
{
f>>m>>n;
for(i=1;i<=m;i++)
f>>x[i];
for(j=1;j<=n;j++)
f>>y[j];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(x[i]==y[j])
c[i][j]=c[i-1][j-1]+1;
else c[i][j]=max(c[i-1][j],c[i][j-1]);
i=m;j=n;
while(i)
if (x[i]==y[j])
{b[++nr]=x[i];i--;j--;}
else if(c[i-1][j]<c[i][j-1])
j--;
else
i--;
g<<nr<<endl;
for(i=nr;i;i--)
g<<b[i]<<" ";
return 0;
}