#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main(){
    string s;
    cin >> s;
    vector<int> arr(s.size());
    int j = 0;
    for(auto ch : s){
		if (ch >= '0' && ch <= '9') {
        	arr[j] = ch - '0';
        	++j;
		} else {
			cerr << "Bad input: " << ch << endl;
		}
    }
    for(int i = 0; i < j; ++i)
    	cout << arr[i];
}