#include<bits/stdc++.h>
using namespace std;
long long a=1;
int main()
{
                string s;
                getline(cin,s);
                for(int i=0;i<s.size();i++)
                {
                                if(s[i]==' ')
                                {
                                                while(s[i+a]==' ')
                                                {
                                                                s.erase(s.begin() + i+a);
                                                }
                                }
                                a=1;
                }
                cout<<s<<endl;
}
 

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