#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

#define YES cout << "YES\n"
#define NO cout << "NO\n"

void SOLVE() {
	string s;
	cin >> s;
	int countA = 0;
	int countB = 0;
	int count = 0;
	set<int> win;
	for(int i=0; i<s.length();i++){
		if(s[i]=='A'){
			countA++;
		}else{
			countB++;
		}
		if(countA>countB){
			win.insert(countA);
			
		}
	}
	cout << win.size() << "\n";
	for(int wi: win){
		cout << wi << " ";
	}
}

int main(){
    SOLVE();
}