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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1050][1050],i,j,n,m,x[1050],y[1050];
void cc(int i,int j,int k)
{
if(k<=a[n][m])
{
if(x[i]==y[j])
{
if(x[i-1]==y[j-1])
cc(i-1,j-1,k+1);
else
if(a[i-1][j]==a[i][j])
cc(i-1,j,k+1);
else
cc(i,j-1,k+1);
g<<x[i]<<" ";
}
else
if(x[i-1]==y[j-1])
cc(i-1,j-1,k);
else
if(a[i-1][j]==a[i][j])
cc(i-1,j,k);
else
cc(i,j-1,k);
}
}
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>x[i];
for(i=1;i<=m;i++)
f>>y[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(x[i]==y[j])
a[i][j]=a[i-1][j-1]+1;
else
a[i][j]=max(a[i-1][j],a[i][j-1]);
}
g<<a[n][m]<<'\n';
cc(n,m,1);
return 0;
}