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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int x[1025],y[1025],n,m,v[1025],a[1025][1025];
void citire()
{
f>>n>>m;
for(int i=1;i<=n;++i)
f>>x[i];
for(int j=1;j<=m;++j)
f>>y[j];
}
void dinamica()
{
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j)
if(x[i]==y[j]) a[i][j]=a[i-1][j-1]+1;
else a[i][j]=max(a[i-1][j],a[i][j-1]);
g<<a[n][m]<<'\n';
}
void afisare(int i,int j)
{
int k=0;
while(i>0 && j>0)
{
if(x[i]==y[j])
{
v[++k]=x[i];
--i;
--j;
}
else if(a[i][j]==a[i-1][j]) --i;
else if(a[i][j-1]==a[i][j-1]) --j;
}
for(int i=k;i>=1;--i)
g<<v[i]<<" ";
}
int cmmdc(int x,int y)
{
int r;
while(y)
{
r=x%y;
x=y;
y=r;
}
return x;
}
int main()
{
citire();
dinamica();
afisare(n,m);
cout<<cmmdc(8,4);
return 0;
}