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//#pragma GCC optimize("O3, Ofast, unroll-loops")
#include <bits/stdc++.h>
using namespace std;
int mat[1025][1025], v[1025], v2[1025];
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>>v2[i];
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(v[i]==v2[j])
mat[i][j]=mat[i-1][j-1]+1;
else
mat[i][j]=max(mat[i][j], max(mat[i][j-1], mat[i-1][j]));
}
}
cout<<mat[n][m]<<'\n';
for(int i=1; i<=m; i++)
{
if(mat[n][i]==mat[n][i-1]+1)
cout<<v[i]<<" ";
}
return 0;
}