#include<bits/stdc++.h>
#define in cin
#define out cout
#define MAXN 2000
using namespace std;

ifstream f("data.in");
char s[MAXN];

void rewrite(char *s) {

    for (int i = 0; i < strlen(s); i++) {

        if (s[i] == '-')
         continue;

        if (s[i] == '.')
            continue;

        if (s[i] == ',') {
            if (i == 0 || s[i - 1] != ' ')
                out << ' ';
            out << s[i];
            continue;
        }

        out << s[i];
    }

    out << '\n';
}

int main() {
    in.getline(s, MAXN);
    rewrite(s);
    return 0;
}