#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
int L,q;
cin>>L>>q;
while (q--){
string name;
cin>>name;
if (name[0]=='a'||name[0]=='b'){
int AB,cur=0;
cin>>AB;
vector<int> v(19),ans;
for (int i=18;i>=0;i--){
v[i]=AB&1;
AB>>=1;
}
for (int i=0;i<19;i++){
cur<<=1;
cur+=v[i];
if (name[0]=='b'&&v[i]&&cur) ans.push_back(cur-1);
if (name[0]=='a'&&!v[i]&&cur) ans.push_back(cur);
}
cout<<ans.size()<<" ";
for (int i:ans) cout<<i<<" ";
cout<<endl;
}
else{
int n;
cin>>n;
bool flag=0;
while (n--){
int num;
cin>>num;
if (num==2) flag=1;
}
if (flag) puts("B");
else puts("A");
}
}
return 0;
}
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