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#include <bits/stdc++.h>
using namespace std;
int v[1025][1025],a[1025],b[1025];
int main()
{
int m ,n,i,j;
cin>>m>>n;
for(i=1;i<=m;i++)
cin>>a[i];
for(j=1;j<=n;j++)
cin>>b[j];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j])
v[i][j]=v[i-1][j-1]+1;
else
v[i][j]=max(v[i-1][j],v[i][j-1]);
cout<<v[m][n]<<endl;
stack<int>st;
while(m*n)
{
if(a[m] == b[n])
{
st.push(a[m]);
--m;
--n;
continue;
}
if(v[m][n]==v[m-1][n])
--m;
else
--n;
}
while(!st.empty())
{
cout<<st.top()<<" ";
st.pop();
}
return 0;
}