#define _USE_MATH_DEFINES
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define RT return
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;

void solve() {
    string S;
    cin >> S;
    reverse(all(S));

    int N = sz(S);
    vi A(N + 1);
    rep(i, N)A[i] = S[i] - '0';

    int ans = 0;
    rep(i, N) {
        if (A[i] == 2) {
            A[i] = 0;
            A[i + 1] += 1;
        }else if (A[i] && A[i + 1]) {
            ans++;
            A[i] = 0;
            A[i + 1]++;
        } else if (A[i] == 1) {
            ans++;
            A[i] = 0;
        }
    }
    if (A[N])ans++;

    cout << ans << endl;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout << fixed << setprecision(15);
	solve();
	return 0;
}