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

int main(){
string s;
int u=0;
getline(cin,s);
for(int i=0;i<s.size();i++){
	if(s[i]==' ') cout<<s[i];	
	}
for(int i=0;i<s.size();i++){
	if(s[i]!=' ') cout<<s[i];	
	}


}

/**************************************************************
	Problem: 1102
	User: wuzhijing
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2076 kb
****************************************************************/