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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, a[1030], b[1030], dp[1030][1030];
stack<int> sol;
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
{
fin>>a[i];
}
for(int i=1;i<=m;i++)
{
fin>>b[i];
}
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(a[i]==b[j])
{
dp[i][j]=dp[i-1][j-1]+1;
}
else
{
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
}
}
}
int lung=dp[n][m], i=n, j=m;
fout<<lung<<"\n";
while(lung!=0)
{
if(a[i]==b[j])
{
sol.push(a[i]);
lung--;
i--;
j--;
}
else
{
if(dp[i-1][j]>dp[i][j-1])
{
i--;
}
else
{
j--;
}
}
}
while(!sol.empty())
{
fout<<sol.top()<<" ";
sol.pop();
}
return 0;
}