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#include<iostream>
#include<fstream>
#include<algorithm>
#include<string>
using namespace std;
int main()
{
ifstream si;
si.open("cmlsc.in");
ofstream so;
so.open("cmlsc.out");
int n,m;
si>>n>>m;
int a[n];
int b[m];
int i;
for(i=0;i<n;++i)
si>>a[i];
for(i=0;i<m;++i)
si>>b[i];
int v[n+1][m+1],j;
for(i=0;i<=n;++i)
v[i][0]=0;
for(i=0;i<=m;++i)
v[0][i]=0;
for(i=1;i<=n;++i)
for(j=1;j<=m;++j)
{
if(a[i-1]==b[j-1])
v[i][j]=v[i-1][j-1]+1;
else
v[i][j]=max(v[i-1][j],v[i][j-1]);
}
int s[v[n][m]],cont=v[n][m]-1;
for(i=n,j=m;i>0;)
{
if(a[i-1]==b[j-1])
{
s[cont]=a[i-1];
--cont;
--i;
--j;
}
else
{
if(v[i][j-1]>v[i-1][j])
--j;
else
--i;
}
}
so<<v[n][m]<<'\n';
for(i=0;i<v[n][m];++i)
so<<s[i]<<' ';
so<<'\n';
}