#include <iostream>

using namespace std;

typedef basic_string<char> string;
int rounds[2000];

int main() {
    string input;
    cin >> input;       //Input
    int input_length = input.length(); //StringLength
    int ACounts = 0, BCounts = 0, AWins = 0, BWins = 0, pos = 0;

    for (int k = 1; k < input_length; k++) {
        for (int pos = 0; pos < input_length; pos++) {
            if (input[pos] == 'A') { ACounts++; }
            else { BCounts++; }

            if (ACounts == k) {
                AWins++;
                ACounts = BCounts = 0;
            }
            else if (BCounts == k) {
                BWins++;
                BCounts = ACounts = 0;
            }
        }
        if (AWins > BWins) { rounds[pos++] = k; }
        ACounts = BCounts = AWins = BWins = 0;
    }
    
    cout << pos << endl;
    for (int i = 0; i < pos; i++) {
        cout << rounds[i] << " ";
        if (i == pos-1) {
            cout << endl;
        }
    }

    return 0;
}