include <bits/stdc++.h>

using namespace std;

int main()
{
string s;
getline(cin, s);
for(int i = 1; i < s.length(); i++)
while(s[i-1] == ' ' && s[i] == ' ') s.erase(i, 1);
if(s[0] == ' ') s.erase(0,1);
if(s[s.length()-1] == ' ') s.erase(s.length()-1, 1);
cout << s;
return 0;
}