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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int i,n,m,a[1025][1025],x[1025],y[1025],sol[1025],j;
void afisare()
{ int i=n,j=m;
int l=a[n][m];
g<<l<<'\n';
while(l)
if(x[i]==y[j]){sol[l]=x[i];l--;i--;j--;}
else if(a[i-1][j]>a[i][j-1])i--;
else j--;
for(int k=1;k<=a[n][m];k++)g<<sol[i]<<" ";
}
void cmlsc()
{ int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(x[i]==y[j])a[i][j]=1+a[i-1][j-1];
else a[i][j]=max(a[i-1][j],a[i][j-1]);
}
}
int main()
{ int i;
f>>n>>m;
for(i=1;i<=n;i++)
f>>x[i];
for(i=1;i<=m;i++)
f>>y[i];
cmlsc();
afis();
return 0;
}