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#include <iostream>
#include <fstream>
using namespace std;
int v1[1030],v2[1030],f1[260],f2[260],i,m,n,mx,l,c[260],j;
int main()
{
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
in>>n>>m;
for(i=1;i<=n;i++)
{
in>>v1[i];
if(mx<v1[i])
{
mx=v1[i];
}
f1[v1[i]]++;
}
for(i=1;i<=m;i++)
{
in>>v2[i];
if(mx<v2[i])
{
mx=v2[i];
}
f2[v2[i]]++;
}
for(i=1;i<=mx;i++)
{
if(f1[i]!=0 && f2[i]!=0)
{
l++;
c[j]=i;
j++;
}
}
out<<l<<"\n";
for(i=0;i<j;i++)
{
if(c[i]!=0)
{
out<<c[i]<<" ";
}
}
return 0;
}