#include <iostream>

using namespace std;

int main(void)
{
    string s;
    while (cin >> s) {
        if (s == ".") break;
        bool flag;
        int n = s.size();
        for (int i = 1; i <= n; i++) {
            flag = false;
            for (int j = 0; j < n; j++) {
                if (s[j] != s[j%i]) {
                    flag = true;
                    break;
                }
            }
            if (!flag) {
                cout << n / i << endl;
                break;
            }
        }
        if (flag) puts("-1");
    }
    return 0;
}