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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int frecv[257], fre[257];
int main()
{
int m,n,x;
in>>m>>n;
int mini=257, maxi=0;
for(int i=0; i<m; ++i)
{
in>>x;
frecv[x]++;
if(x<mini)
mini=x;
if(x>maxi)
maxi=x;
}
for(int i=0; i<n; ++i)
{
in>>x;
fre[x]++;
if(x<mini)
mini=x;
if(x>maxi)
maxi=x;
}
int length=0;
for(int i=mini; i<=maxi; ++i)
{
if(frecv[i]>0 && fre[i]>0)
++length;
}
out<<length<<'\n';
for(int i=mini; i<=maxi; ++i)
{
if(frecv[i]>0 && fre[i]>0)
out<<i<<" ";
}
return 0;
}