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#include <iostream>
#include <fstream>
#include <stack>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,v1[1028],v2[1028],dp[1028][1028];
stack<int>q;
void idk()
{
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
{
if(v1[i]==v2[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
void afisare()
{
fout<<dp[n][m]<<endl;
int i=n,j=m;
while(dp[i][j])
{
if(dp[i][j-1]==dp[i][j])
j--;
else if(dp[i][j]==dp[i-1][j])
i--;
else
{
q.push(v1[i]);
i--;
j--;
}
}
while(!q.empty())
{
fout<<q.top()<<' ';
q.pop();
}
}
int main()
{
fin>>n>>m;
for(int i=1; i<=n; i++)
fin>>v1[i];
for(int i=1; i<=m; i++)
fin>>v2[i];
idk();
afisare();
return 0;
}