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#include <iostream>
#include<fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n , m, dp[1025][1025] , a[1025] , b[1025];
void sirul(int l , int c)
{
if(l==0||c==0)
return;
if(a[l]==b[c])
{
sirul(l-1 , c-1);
out<<a[l]<<" ";
}
else if(dp[l-1][c]>dp[l][c-1])
{
sirul(l-1 , c);
}
else sirul(l , c-1);
}
int main() {
in>>m>>n;
for(int i=1;i<=m;i++)
in>>a[i];
for(int i=1;i<=n;i++)
in>>b[i];
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
if(a[i]==b[j])
dp[i][j]=1+dp[i-1][j-1];
if(a[i]!=b[j])
dp[i][j]=max(dp[i][j-1] , dp[i-1][j]);
}
}
out<<dp[m][n]<<'\n';
sirul(m , n);
return 0;
}