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#include <bits/stdc++.h>
using namespace std;
int dp[1050][1050];
int v[1030];
int m1[1030];
queue<int>pq;
int main()
{
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int n,m;
cin>>n>>m;
for(int i=1;i<=n;i++)
cin>>v[i];
for(int i=1;i<=m;i++)
cin>>m1[i];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(v[i]==m1[j])
{
pq.push(v[i]);
dp[i][j]++;
}
}
}
cout<<dp[n][m]<<endl;
while(!pq.empty())
{
cout<<pq.front()<<" ";
pq.pop();
}
return 0;
}