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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
short int fn[257], fm[257];
int main()
{
int n,m,i,x,L=0,l,j;
fin>>n>>m;
for(i=1;i<=n;i++)
{
fin>>x;
fn[x]++;
}
for(i=1;i<=m;i++)
{
fin>>x;
fm[x]++;
}
for(i=0;i<=257;i++)
L+=min(fn[i],fm[i]);
fout<<L<<"\n";
for(i=0;i<=257;i++)
{
l=min(fn[i],fm[i]);
for(j=1;j<=l;j++)
fout<<i<<" ";
}
return 0;
}