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

int main() { ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

string s;
string c;
getline(cin,s);
for(int i=0;i<s.length();++i)
{
    if(i==0||i==s.length()-1)
    c.push_back(s[i]);
    if(i>0&&i<=s.length()-2)
    {
        if(s[i] ==' '&&s[i+1]==' ')
        {
            continue;
        }
        else
        c.push_back(s[i]);
    }
}
cout<<c<<"\n";
return 0;

}