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#include <cstdio>
using namespace std;
int a[1024], b[1024], m, n, com[1024], lm;
void citire(int a[1024], int &m, int b[1024], int &n)
{
scanf("%d %d\n", &m, &n);
for(int i=0; i<m; i++)
scanf("%d ", &a[i]);
for(int i=0; i<n; i++)
scanf("%d ", &b[i]);
}
void lungime(int a[1024], int m, int b[1024], int n)
{
int ui=0, uj=0;
for(int i=0; i<m; i++)
for(int j=0; j<n; j++)
{
if(a[i]==b[j]&&i>=ui&&j>=uj)
{
com[lm++]=a[i];
ui=i;
uj=j;
}
}
printf("%d\n", lm);
for(int i=0; i<lm; i++)
printf("%d ", com[i]);
}
int main()
{
freopen("cmlsc.in", "r", stdin);
freopen("cmlsc.out", "w", stdout);
citire(a, m, b, n);
lungime(a, m, b, n);
return 0;
}