//方法一
#include <iostream>
using namespace std;
int main()
{
string s;
while(cin >> s) cout << s << " ";
return 0;
}
//方法二
#include <iostream>
using namespace std;
int main()
{
string s1,s2;
getline(cin, s1);
for(int i = 0; i < s1.size(); i++)
if(s1[i] != ' ') s2 += s1[i];
else
{
s2 += ' ';
int j = i;
while(j < s1.size() && s1[j] == ' ') j++;
i = j - 1;
}
cout << s2 << endl;
return 0;
}