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#include<iostream>
#include<fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream o("cmlsc.out");
int main()
{
int i,j,m,n,nr,k,x[1024],y[1024],s[1024];
nr= 0 ;
int aux=0;
k= 0 ;
f>>m>>n;
for(i=1;i<=m;i++)
f>>x[i];
for(i=1;i<=n;i++)
f>>y[i];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(x[i]==y[j])
{nr++;k++;s[k]=x[i];}
for(i=1;i<=k;i++)
if(s[i]>s[i+1])
{
aux=s[i];
s[i]=s[i+1];
s[i+1]=aux;
}
o<<nr<<endl;
for(i=1;i<=k;i++)
o<<s[i]<<" ";
}