#include <iostream>
#include <iomanip>
#include <string>
#include <set>
#include <sstream>
using namespace std;
int main()
{
string in;
getline(cin,in);
set<string> st;
istringstream is(in);
while(is >> in) st.insert(in);
for(auto s: st) cout << s << " ";
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8aW9tYW5pcD4KI2luY2x1ZGUgPHN0cmluZz4KI2luY2x1ZGUgPHNldD4KI2luY2x1ZGUgPHNzdHJlYW0+Cgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKQp7CiAgICBzdHJpbmcgaW47CiAgICBnZXRsaW5lKGNpbixpbik7CiAgICBzZXQ8c3RyaW5nPiBzdDsKICAgIGlzdHJpbmdzdHJlYW0gaXMoaW4pOwogICAgd2hpbGUoaXMgPj4gaW4pIHN0Lmluc2VydChpbik7CiAgICBmb3IoYXV0byBzOiBzdCkgY291dCA8PCBzIDw8ICIgIjsKfQo=