#include <bits/stdc++.h>
using namespace std;

vector<string> dict;

int main()
{
	string a;
	while(cin >> a) dict.push_back(a);
	sort(dict.begin(),dict.end());
	for(int i = 0;i<dict.size()-1;i++) cout << dict[i] << ",";
	cout << dict.back();
	return 0;
}

C++ :

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;

int main()
{
    char s1[10]={0},s2[10]={0};
    gets(s1);
    gets(s2);

    if(strcmp(s1,s2)>0){swap(s1,s2);}
    printf("%s\n%s",s1,s2);
    return 0;
}