11687 - Digits

/*
 *
 * problem link: https://onlinejudge.org/index.php?option=onlinejudge&Itemid=8&page=show_problem&category=0&problem=2734&mosmsg=Submission+received+with+ID+27782167
 *
 * */

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
#define sz(x) int(x.size())
#define all(x) x.begin(), x.end()

int main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

    string s;
    while (cin >> s, s != "END") {
        string prev = "0";
        int i = 0;
        if (s != "1")
        while (sz(s) != stoi(prev)) {
            prev = to_string(sz(s));
            s = prev;
            i++;
        }
        cout << i + 1 << endl;
    }
}