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#include <iostream>
#include <fstream>
#define NMAX 1024
using namespace std;
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[NMAX],b[NMAX],v[NMAX][NMAX];
void citire(int n,int *v)
{
for(int i=0;i<n;++i)
f>>v[i];
}
void LCS()
{
for(int i=0;i<n;++i)
for(int j=0;j<m;++j)
if(a[i]==b[j])
v[i+1][j+1]=v[i][j]+1;
else
v[i+1][j+1]=max(v[i+1][j],v[i][j+1]);
}
int main()
{
f>>n>>m;
citire(n,a);
citire(m,b);
LCS();
g<<v[n][m]<<'\n';
int i=n,j=m,res[NMAX],k=0;
while(i>0 && j>0)
{
if(a[i-1]==b[j-1])
{
res[k++]=a[i-1];
--i;
--j;
}
else
if(v[i-1][j]==v[i][j])
--i;
else
--j;
}
for(i=k-1;i>=0;--i)
g<<res[i]<<' ';
return 0;
}