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#include <iostream>
#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, a[1025], b[1025], dp[1025][1025];
queue <int> q;
int main()
{
fin>>n>>m;
for(int i=1; i<=n; i++)
{
fin>>a[i];
}
for(int i=1; i<=m; i++)
{
fin>>b[i];
}
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(a[i]==b[j])
{
q.push(a[i]);
dp[i][j]=dp[i-1][j-1]+1;
}
else
{
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
}
}
}
fout<<dp[n][m]<<"\n";
while(!q.empty())
{
fout<<q.front()<<" ";
q.pop();
}
return 0;
}