#include <iostream>
#include <vector>
using namespace std;

int main() {
	string s; cin >> s;
	vector<int> out;
	for (int i = 1; i < s.size(); i++) {
		int a = 0, b = 0;
		int awon = 0, bwon = 0;
		for (int j = 0; j < s.size(); j++) {
			if (s[j] == 'A') a++;
			else b++;
			if (a == i) {
				awon++;
				a = 0;
				b = 0;
			}
			else if (b == i) {
				bwon++;
				a = 0;
				b = 0;
			}
		}
		if (awon > bwon) out.push_back(i);
	}
	cout << out.size() << endl;
	for (int i :  out) cout << i << ' ';
	cout << endl;
}