#include"bits/stdc++.h" #include"atcoder/all" using namespace std; using namespace atcoder; #pragma GCC target("avx2") #pragma GCC optimize("O2") #pragma GCC optimize("unroll-loops") using ll = long long; using ld = long double; #define rep(i,m,n) for(ll i=(ll)m;i<(ll)n;i++) #define drep(i,m,n) for(ll i=m-1;i>=n;i--) #define Endl endl #define pr(i,j) make_pair(i,j) #define isin(x,l,r) (l<=x&&x<r) #define chmin(a,b) a=min(a,b) #define chmax(a,b) a=max(a,b) #define srt(ar) sort(ar.begin(),ar.end()) #define rev(ar) reverse(ar.begin(),ar.end()) #define jge(f) cout<<(f?"Yes":"No")<<endl const ll inf = 1e18; const ld pi = 3.14159265358979; using mint = modint998244353; clock_t ST, FN; int main() { ST = clock(); ios::sync_with_stdio(false); cin.tie(nullptr); string s; cin >> s; ll ans = 0; rep(i, 1, s.length()) { string a = s.substr(0, i); string b = s.substr(i); if (b[0] == '0')continue; ans++; } cout << ans << endl; }