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#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int M, N, A[1025], B[1025], i, j, l, C[1025], k, ok;
int main()
{f>>M>>N;
for(i=1; i<=M; i++)
f>>A[i];
for(j=1; j<=N; j++)
f>>B[j];
i=k=1;
while(i<=M)
{ok=0;
for(j=k; j<=N; j++)
if(A[i]==B[j])
{l++;
ok=1;
C[l]=A[i];
break;}
if(ok==1)
k=j+1;
i++;
}
g<<l<<endl;
for(i=1; i<=l; i++)
g<<C[i]<<" ";
return 0;
}