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

int main(){
	int sum = 0, n = 0;
	string s;

	while( getline(cin,s) ){
		for(int i=0 ; i<s.size() ; i++){
			if( s[i]>='0' && s[i]<='9'){
				n *= 10;
				n += s[i]-'0';
			}else{
				sum += n;
				n = 0;
			}
		}
	}
	cout << sum << endl;
	return 0;
}