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#include <iostream>
#include <fstream>
#define MAX 1025
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int v[MAX],x[MAX],a[MAX][MAX];
void afis(int i,int j)
{
if(i>=1&&j>=1)
{
if(v[i]!=x[j])
{if(a[i-1][j]>a[i][j-1]) afis(i-1,j);
else afis(i,j-1);}
else {
afis(i-1,j-1);
g<<a[i]<<" ";
}
}
}
int main()
{
int n,m,i,j;
f>>n>>m;
for(i=1;i<=n;i++)
f>>v[i];
for(j=1;j<=m;j++)
f>>x[j];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(v[i]==x[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';
afis(n,m);
return 0;
}