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#include <iostream>
#include <fstream>
using namespace std;
int a[100],b[100],c[100][100],n,m;
void citire()
{
ifstream f("cmlsc.in");
f>>n>>m;
for(int i=1;i<=n;i++)
{
f>>a[i];
}
for(int i=1;i<=m;i++)
{
f>>b[i];
}
}
int maxim(int x,int y)
{
if(x>y)
return x;
else return y;
}
void program()
{
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
c[i][j]=1+c[i-1][j-1];
else
{
c[i][j]=maxim(c[i][j-1],c[i-1][j]);
}
}
}
}
void afisare()
{
ofstream g("cmlsc.out");
int max=0;
g<<c[n][m]<<endl;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(max<c[i][j])
{
g<<a[i]<<" ";
max=c[i][j];
}
}
int main()
{
citire();
program();
afisare();
return 0;
}