#include<bits/stdc++.h>
using namespace std;
int main(){
	int i=0;
	string a;
	getline(cin,a);
	for(i=0;i<a.size();i++){
		if(a[i]==' ') cout<<a[i];
	}
	for(i=0;i<a.size();i++){
		if(a[i]!=' ') cout<<a[i];
	}
}
/**************************************************************
	Problem: 1102
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2076 kb
****************************************************************/