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 C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>

int dif(int a,int b){
  if(a>b){
    return a-b;
  }else{
    return b-a;
  }
}

int main(){
  int ad,bd,x,a,b;
  scanf("%d %d %d",&x,&a,&b);
  ad = dif(x,a);
  bd = dif(x,b);
  if(ad>bd){
    printf("B\n");
  }else{
    printf("A\n");
  }
  return 0;
}