B - ABCDEFG

Problem Statement

There are7 pointsA,B,C,D,E,F, andG on a straight line, in this order. (See also the figure below.)

The distances between adjacent points are as follows.

Between

A andB:3

BetweenB andC:1

BetweenC andD:4

BetweenD andE:1

BetweenE andF:5

BetweenF andG:9

You are given two uppercase English letters

p andq. Each ofp andq is A, B, C, D, E, F, or G, and it holds that p<>q.

Find the distance between the points

p andq.

Constraints

Each of  p andq is A,B,C,D,E,F, or G.p<>=q

Input

The input is given from Standard Input in the following format:

p q

Output

Print the distance between the points p and q.

Sample Input 1

A C

Sample Output 1

4

The distance between the points

A andC is

3+1=4.

Sample Input 2

G B

Sample Output 2

20

The distance between the pointsG andB is

9+5+1+4+1=20.

Sample Input 3

C F

Sample Output 3

10

把所有数据放到数组中，然后根据输入的数据相减即可得出，也就是用prefix_sum（前缀和）计算；

下面是代码：