#include <bits/stdc++.h>
#define pb push_back
#define int long long
using namespace std;
const int inf = 1e15 + 10;
const int N = 1e5 + 5;
int32_t main(){
//idk why i keep get wrong answer, so i decide to use this code to check (from SalihSahin)
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
int L;
cin>>L;
int q;
cin>>q;
while(q--){
string s;
cin>>s;
if(s[0] == 'a'){
int a;
cin>>a;
int la = a;
cout<<la<<endl;
for(int i = 1; i <= a; i++){
cout<<i<<" ";
}
cout<<endl;
}
else if(s[0] == 'b'){
int b;
cin>>b;
int lb = b*2;
cout<<lb<<endl;
for(int i = 1; i <= b; i++){
cout<<i<<" ";
cout<<i<<" ";
}
cout<<endl;
}
else{
int cl;
cin>>cl;
vector<int> c(cl);
for(int i = 0; i < cl; i++){
cin>>c[i];
}
if(c[0] == 2) cout<<"B"<<endl;
else cout<<"A"<<endl;
}
}
return 0;
}
