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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
const int N = 1025;
int n,m,a[N],b[N],d[N][N];
vector<int> sol;
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
f>>a[i];
for(int j=1;j<=m;j++)
f>>b[j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
d[i][j]=(a[i]==b[j])?(d[i-1][j-1]+1):max(d[i-1][j],d[i][j-1]);
g<<d[n][m]<<'\n';
while(d[n][m])
{
if(a[n]==b[m])
{
sol.push_back(a[n]);
n--;m--;
}
else
if(d[n-1][m]>d[n][m-1])
n--;
else
m--;
}
reverse(sol.begin(),sol.end());
for(auto it:sol)
g<<it<<' ';
return 0;
}