#include <iostream>
#include<stdio.h>
#include <vector>
#include <string>
using namespace std;


int main() {
	string str;
	
	getline(cin, str);
	int n = str.size();
	for (int i = 0; i < n; i++) {
		if (str[i] != ' ' || (str[i] == ' ' && str[i + 1] != ' '))
			cout << str[i];
	}
	return 0;
}