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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int s[1025][1025],v[1025],u[1025],m,n;
void recursiv (int i,int j)
{
if(i>=1&&j>=1)
{
if(v[i]==u[j])
{
recursiv(i-1,j-1);
g<<v[i]<<" ";
}
else
{
if(s[i-1][j]>s[i][j-1])
recursiv(i-1,j);
else
recursiv(i,j-1);
}
}
}
int main()
{
f>>m>>n;
for(int i=1;i<=m;i++)
f>>v[i];
for(int j=1;j<=n;j++)
f>>u[j];
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
if(v[i]==u[j])
s[i][j]= s[i-1][j-1]+1;
else
{
if(s[i-1][j]>s[i][j-1])
s[i][j]=s[i-1][j];
else
s[i][j]=s[i][j-1];
}
}
}
g<<s[m][n]<<endl;
recursiv(m,n);
f.close();
g.close();
return 0;
}