include <bits/stdc++.h>

using namespace std;
string s;
long i;
int main()
{getline(cin,s);if (s[s.size()]!=' ') s=s+' ';for (i=0;i<s.size();i++){if (s[i]!=' '&&s[i+1]==' ') s.erase(i,1);}cout<<s;}