#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;

int main() {
	string C;
	cin >> C;
	//cout << stoi("01") << endl;
	//cout << to_string(1) << endl;

	int cnt = 0;
	vector<pair<int, int>> v;
	for (int i = 1; i < C.size(); i++) {
		string s1, s2, s3, s4;
		int n1, n2;

		s1 = C.substr(0, i);
		s2 = C.substr(i, C.size() - i);
		//cout << "s1:" << s1 << ' ' << "s2:" << s2 << endl;
		n1 = stoi(s1);
		n2 = stoi(s2);
		//cout << "n1:" << n1 << ' ' << "n2:" << n2 << endl;
		s3 = to_string(n1);
		s4 = to_string(n2);
		//cout << "s3:" << s3 << ' ' << "s4:" << s4 << endl;

		if ((s1 != s3) || (s2 != s4)) {
			continue;
		}
		else if ((n1 != 0) && (n2 != 0)) {
			cnt++;
		}
	}

	cout << cnt << endl;
}