人机题

#include <iostream>
using namespace std;
int main(){
	int n;
	cin>>n;
	double a=0,b=0;
    a=n/2.0;
	if(n>100){
		b=30+(n-100)*0.6;
	}
	else{
		b=n*0.3;
	}
	if(a>b){
		cout<<"B"<<endl;
		printf("%.1f",b);
	}
	else{
		cout<<"A"<<endl;
		printf("%.1f",a);
	}
	return 0;
}