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