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#include <iostream>
#include <fstream>
#define MAX 1024
using namespace std;
void add_element(int v[MAX], int x, int &n)
{
v[n] = x;
n = n + 1;
}
int main()
{
int a[MAX],b[MAX],c[MAX],
n,m,i,j,k = 0,
last_pos = -1;
ifstream f;
ofstream g;
f.open("cmlsc.in");
g.open("cmlsc.out");
f >> m >> n;
for (i = 0; i < m; i++) f >> a[i];
for (i = 0; i < n; i++) f >> b[i];
for (i = 0; i < n; i++)
{
for (j = 0; j < m; j++)
{
if (b[i] == a[j] && j > last_pos)
{
add_element(c,b[i],k);
if (i == n - 1) break;
last_pos = j;
i++;
}
else if (b[i] == a[j] && j < last_pos)
{
k = 0;
add_element(c,b[i],k);
if (i == n - 1) break;
last_pos = j;
i++;
}
}
}
g << k << '\n';
for (i = 0; i < k; i++)
g << c[i] << ' ';
f.close();
g.close();
return 0;
}