#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    int n;
    cin >> n;
    if(n%2==0){
        if(n==2){
            cout << "impossible\n";
            return 0;
        }
        else{
            cout << 1 << ' ' << n/2-1 << ' ' << n/2 << '\n';
            cout << "B 0 1 U\n";
            for(int i = 0; i<n/2; i++){
                cout << "A " << i << ' ' << 0 << ' ' << 'U' << '\n';
            }
            for(int i = 0; i+1<n/2; i++){
                cout << "B " << i << ' ' << 1 << ' ' << 'D' << '\n';
            }
        }
    }
    else{
        if(n<=5){
            cout << "impossible\n";
            return 0;
        }
        else{
            int a = 2;
            int b = (n-5)/2;
            cout << 2 << ' ' << (n-5)/2 << ' ' << (n-3) << '\n';
            cout << "B " << 0 << ' ' << a << ' ' << 'U' << '\n';
            cout << "B " << 0 << ' ' << a+b << ' ' << 'U' << '\n';
            cout << "B " << 0 << ' ' << a+b << ' ' << 'D' << '\n';
            cout << "B " << b << ' ' << a << ' ' << 'U' << '\n';
            for(int i = 0; i<n-4; i++){
                if(i%2==0){
                    cout << "A " << i << ' ' << 0 << ' ' << 'U' << '\n';
                }
                else{
                    cout << "A " << i-1 << ' ' << 2 << ' ' << 'D' << '\n';
                }
            }
        }
    }
    return 0;
}