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#include <iostream>
#include <fstream>
#define MIN(M,N) ((M)<(N)?(M):(N))
#define MAX(a,b) ((a)>(b)?(a):(b))
using namespace std;
ifstream f("cmlsc.in");
ofstream o("cmlsc.out");
int M,N,A[1024],C[1024],B[1024];
void rez(){
f>>M>>N;
int min=256,max=-1,MAX=0;
for(int i=0;i<M;i++){
f>>A[i];
C[A[i]]++;
min=MIN(min,A[i]);
max=MAX(max,A[i]);
}
for(int i=0;i<N;i++){
f>>B[i];
C[B[i]]++; if(C[B[i]]==2) MAX++;
min=MIN(min,B[i]);
max=MAX(max,B[i]);
}
o<<MAX<<endl;
for(int i=min;i<=max;i++)
if(C[i]==2) o<<i<<" ";
}
int main()
{
rez();
return 0;
}