#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;
}
#include <iostream>
using namespace std;
int main()
{
string s1;
while (cin >> s1)
{
cout << s1 << ' ';
}
return 0;
}