#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let a = read::<f64>();
    if a == 1.0 {
        println!("A 1");
        return;
    }

    if a < 1.0 {
        let a = (a * 1000.0).round() as i64;
        let lcm = 1000 * a / gcd(a, 1000);
        let b = lcm / a;
        let r = (b - 1) * 2 + lcm / 1000 - 1;
        println!("C {}", r);
    } else {
        assert!(false);
        let a = ((1.0 / a) * 1000.0).round() as i64;
        let lcm = 1000 * a / gcd(a, 1000);
        let b = lcm / a;
        let r = (b - 1) * 2 + lcm / 1000 - 1;
        println!("B {}", r);
    }
}

fn gcd(a: i64, b: i64) -> i64 {
    if b == 0 {
        return a;
    }
    gcd(b, a % b)
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}