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#include <iostream>
#include <fstream>
#define NMAX 1110
using namespace std;
ifstream fin("cmlsc.in");
ofstream gout("cmlsc.out");
int a[NMAX], b[NMAX], dp[NMAX][NMAX],n,m,v[NMAX],k,maxi;
void citire()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int i=1;i<=m;i++)
fin>>b[i];
}
void matrice()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
int main()
{
citire();
matrice();
gout<<dp[n][m]<<'\n';
maxi=dp[n][m];
while(maxi>0)
{
if(a[n]==b[m])
{
v[k]=a[n];
k++;
n--;
m--;
maxi--;
}
else
{
if(dp[n][m-1]>dp[n-1][m])
n--;
else m--;
}
}
for(int i=k-1;i>=0;i--)
gout<<v[i]<<" ";
return 0;
}