#include<iostream>
#include<vector>
#include<set>
#include<map>
#include<list>
#include<stack>
#include<queue>
#include<bitset>
#include<array>
#include<algorithm>
#include<cstdio>
#include<string>
#include<cstdlib>
#include<numeric>
#define D long long
#define U unsigned
#define SHIKOU 3000000
using namespace std;
D n, m,a, b, d, e, x, y, z;
D i, j, k;
char c,f;
string s;
D ans;
int main() {
	D t;
	cin >> s;
	for (auto z : s) {
		if(z>='0'&&z<='9')
			ans += z-'0';
	}
	cout << ans << endl;
}