#include <iostream>

using namespace std;

int main() {
    string str;
    getline(cin, str);

    string res;
    for (int i = 0; str[i]; i++) {
       if (str[i] != ' ') res = res + str[i];
       else if (str[i] == ' ' && res[res.size()-1] != ' ') res = res + str[i];
    }
    cout << res << endl;
    return 0;
}