hdu1412

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#include"iostream"
#define M 20000
#include"algorithm"
using namespace std;
int c[M];
int main()
{
int n,m;
int a,b;
int i,j;
while(cin>>n>>m)
{
int k=0;
for(i=0;i<n;i++) { cin>>a; c[k++]=a;}
for(i=0;i<m;i++) { cin>>b; c[k++]=b;}
sort(c,c+k);
for(i=0;i<k;i++)
{
if(c[i]!=c[i+1])
{
cout<<c[i];
if(i!=k-1) cout<<" ";
}
}
cout<<endl;
}
return 0;
}