Problem:
Score : 100 points

Problem Statement

Snuke lives at position x on a number line.
On this line, there are two stores A and B, respectively at position a and b, that offer food for delivery.

Snuke decided to get food delivery from the closer of stores A and B.
Find out which store is closer to Snuke's residence.

Here, the distance between two points s and t on a number line is represented by |s-t|.

Constraints

1 \leq x \leq 1000

1 \leq a \leq 1000

1 \leq b \leq 1000

x, a and b are pairwise distinct.

The distances between Snuke's residence and stores A and B are different.

Input

Input is given from Standard Input in the following format:

x a b

Output

If store A is closer, print A; if store B is closer, print B.

Sample Input 1

5 2 7

Sample Output 1

B

The distances between Snuke's residence and stores A and B are 3 and 2, respectively.
Since store B is closer, print B.

Sample Input 2

1 999 1000

Sample Output 2

A

Solution in JavaScript (node.js v5.12) (judge verdict: Accepted)

function Main(input) {
  const numbers = input.split(' ').map(n => Number(n));
  const x = numbers[0];
  const a = numbers[1];
  const b = numbers[2];

  if (Math.abs(x - a) > Math.abs(x - b)) {
    console.log('B');
  } else {
    console.log('A');
  }
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));