#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main() {
    ifstream f;
    f.open("input.txt", ios::in);
    string s;
    while (getline(f, s)) {
        for (size_t i = 0; i < s.size(); ++i) {
            if(isdigit(s[i])) {
                cout << s[i];
            } else if (s[i] == ' ') {
                cout << " ";
            }
        }
        cout << " ";
    }
    f.close();
}