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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int v[1030][1030],a[1030],b[1030],t[1030],k;
void sir(int x,int y)
{
if(x>=1 && y>=1)
{
if(a[x]==b[y])
{
k++;
t[k]=a[x];
sir(x-1,y-1);
}
else
{
if(v[x-1][y]>v[x][y-1])
{
sir(x-1,y);
}
else
{
sir(x,y-1);
}
}
}
}
int main()
{
int n,m,i,j;
f>>n>>m;
for(i=1;i<=n;i++)
{
f>>a[i];
}
for(j=1;j<=m;j++)
{
f>>b[j];
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;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]);
}
}
}
g<<v[n][m]<<"\n";
sir(n,m);
for(i=k;i>=1;i--)
g<<t[i]<<" ";
return 0;
}