#include <iostream>
#include <cstring>

using namespace std;

const int N = 500;

char ans[N];

int main(void)
{
    string str;

    getline(cin, str);

    int cnt = 0;
    for (int i = 0; i < str.size(); i++) {
        if (str[i] != ' ') {
            ans[cnt++] = str[i];
        } else {
            while (str[i] == ' ') i++;
            ans[cnt++] = ' ';
            i--;
        }
    }

    cout << ans << endl;

    return 0;
}