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#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int i,j,k,nr,n1,n2,v1[257],v2[257],c[1025],cc=0;
int main()
{
f>>n1>>n2;
for(i=0;i<n1;i++)
{
f>>nr;
v1[nr]++;
}
for(j=0;j<n2;j++)
{
f>>nr;
v2[nr]++;
}
for(i=0;i<257;i++)
if(v1[i]!=0&&v2[i]!=0)
{
if(v1[i]==v2[i])
{
k=v1[i];
for(j=0;j<k;j++)
{
c[cc]=i;
cc++;
}//c[cc]=i;cc++;
}
else
{ k=abs(v1[i]-v2[i]);
for(j=0;j<k;j++)
{
c[cc]=i;
cc++;
}
}
}
g<<cc<<'\n';
for(i=0;i<cc;i++)
g<<c[i]<<" ";
return 0;
}