#include <iostream>
#include <cmath>
#include <vector>
using namespace std;
int check(const string& s, int& k) {
    int cnt1 = 0, cnt2 = 0, k1 = 0, k2 = 0; // 1 is Alice, 2 is Bob
    int i = 0;
    while (i < s.length()) {
        if (s[i] == 'A')
            k1++;
        else 
            k2++;
        if (k1 == k) {
            cnt1++;
            k1 = k2 = 0;
        }
        else if (k2 == k) {
            cnt2++;
            k1 = k2 = 0;
        }
        i++;
    }
    if (cnt1 > cnt2)
        return true;
    return false;
}

int main() {
    string s;
    cin >> s;
    vector<int> res;
    for (int i = 1; i <= s.length(); i++)
        if (check(s, i))
            res.emplace_back(i);
    cout << res.size() << endl;
    for (int i = 0; i < res.size(); i++)
        cout << res[i] << " ";
}