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#include <iostream>
#include<fstream>
#define mx 1025
using namespace std;
fstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[mx], b[mx],d[mx][mx],c[mx],n,m,nr;
int main()
{
int i,j;
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>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]);
fout<<d[n][m]<<'\n';
i=n; j=m;
while(i!=0 && j!=0)
{
if(a[i]==b[j])
{
c[++nr]=a[i];
--i; --j;
}
else if (d[i-1][j]>d[i][j-1]) --i;
else --j;
}
for(i=nr;i>=1;i--)
fout<<c[i]<<" ";
fin.close();
fout.close();
return 0;
}