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#include <iostream>
#include <fstream>
using namespace std;
int v1[1025],v2[1025];
int main()
{
int m,n,x,k=0,i,v3[1025];
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
f>>n;
f>>m;
for(i=1;i<=n;i++)
{
f>>x;
v1[x]++;
}
for(i=1;i<=m;i++)
{
f>>x;
v2[x]++;
}
for(i=1;i<=256;i++)
{
if(v1[i]==v2[i] && v1[i]!=0)
{
k++;
v3[k]=i;
}
}
g<<k<<endl;
for(i=1;i<=k;i++)
g<<v3[i]<<" ";
}