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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
long long v[1030],a[1030],mat[1025][1025];
vector<int>rez;
int main()
{
long long n,m;
f>>n>>m;
for(int i=1; i<=n; i++)
f>>v[i];
for(int j=1; j<=m; j++)
f>>a[j];
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
if(v[i]==a[j])
mat[i][j]=mat[i-1][j-1]+1;
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
g<<mat[n][m]<<'\n';
int i=n,j=m,p=mat[n][m];
while(p)
if(v[i]==a[j]&&p==mat[i][j])
rez.push_back(v[i]),i--,j--,p--;
else
{
if(mat[i-1][j]>mat[i][j-1])
i--;
else j--;
}
for(int i=rez.size()-1;i>=0;i--)
g<<rez.at(i)<<" ";
return 0;
}