#include <iostream>
#include <cstring>

using namespace std;

const int LEN_MAX = 1000;

char s[LEN_MAX];

void rescrie(char *s) {
    int n = strlen(s);
    for (int i = 0; i < n; i++) {
        if (s[i] == '.') continue;
        if (s[i] == '-') continue;
        if (s[i] == ',') {
            if (i == 0 || s[i - 1] != ' ') cout << ' ';
            cout << s[i];
            continue;
        }
        cout << s[i];
    }

    cout << '\n';
}

int main() {
    cin.getline(s, 1000);
    rescrie(s);
    return 0;
}