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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,i,a[1001][1001],j,m,x[1001],y[1001];
void afis(int i, int j)
{if(i==1&&j==1)if(x[i]=y[j])g <<x[i]<<" ";
if(i>1||j>1)
{
if(x[i]==y[j]){afis(i-1,j-1);g<<x[i]<<" ";}
else if(a[i][j-1]<a[i-1][j])afis(i-1,j);
else afis(i,j-1);
}
}
int main()
{f >>n;
f >>m;
for(i=1;i<=n;i++)
f >>x[i];
for(i=1;i<=m;i++)
f >>y[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(x[i]==y[j])a[i][j]=a[i-1][j-1]+1;
else
{int mx;
mx=a[i][j-1];
if(a[i-1][j]>mx)mx=a[i-1][j];
a[i][j]=mx;
}
}
g <<a[n][m]<<endl;
afis(n,m);
return 0;
}