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Cod sursa(job #858659)
#include <cstdio>
using namespace std;
int n,m,a[2000],b[2000];
void citire ()
{
freopen("cmlsc.in","r",stdin);
scanf("%d %d",&n,&m);
for(int i=1;i<=n;i++)
scanf("%d",&a[i]);
for(int i=1;i<=m;i++)
scanf("%d",&b[i]);
}
int sol[2000],k=1;
int main ()
{
citire();
int l=1;
for(int i=1;i<=n;i++)
{
for(int j=l;j<=m;j++)
if(a[i]==b[j]){
sol[k++]=a[i];
l=j;
break;
}
}
printf("%d\n",k-1);
for(int i=1;i<k;i++)
printf("%d ",sol[i]);
}