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#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("cmlsc.in");
ofstream out ("cmlsc.out");
int n,m,d[1030][1030],a[1030],b[1030];
void afis (int i,int j)
{
if(i==0 or j==0)
return;
if(a[i]==b[j])
{
afis(i-1,j-1);
out<<a[i]<<" ";
return;
}
if(d[i-1][j]>d[i][j-1])
afis(i-1,j);
else
afis(i,j-1);
}
int max(int a,int b)
{
if(a>=b)
return a;
else
return b;
}
int main()
{
in>>n>>m;
int i,j;
for(i=1; i<=n; i++)
in>>a[i];
for(i=1; i<=m; i++)
in>>b[i];
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
{
if(a[i]==b[j])
d[i][j]=1+d[i-1][j-1];
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
out<<d[n][m]<<'\n';
afis(n,m);
return 0;
}