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OI-codes/Luogu/P2562/P2562.cpp

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#include <bits/stdc++.h>
using namespace std;
string work(string s) {
if (s.find('1') == string::npos) {
return "A";
}
if (s.find('0') == string::npos) {
return "B";
}
return "C" + work(s.substr(0, s.size() / 2)) + work(s.substr(s.size() / 2));
}
int main() {
string s;
cin >> s;
cout << work(s) << endl;
return 0;
}