Problem Description

JOI's height one year ago was $A\ \:\ \mathrm{cm}$. JOI's current height is $B\ \:\ \mathrm{cm}$.

It is known that JOI's height has increased over the past year.

Output how much JOI's height has increased in $\mathrm{cm}$ over the past year.

Input Format

The input is given from the standard input in the following format:

$ A $ $ B $

Output Format

Output how much JOI's height has increased in $\mathrm{cm}$, omitting the unit ($\mathrm{cm}$).

Sample Input and Output

Sample Input #1

150
155

Sample Output #1

5

Sample Input #2

100
101

Sample Output #2

1

Sample Input #3

100
200

Sample Output #3

100

Notes/Hints

Constraints

• $100\ \leqq\ A\ <\ B\ \leqq\ 200$.
• All values input are integers.

Sample Explanation 1

JOI's height one year ago was $150\ \:\ \mathrm{cm}$, and JOI's current height is $155\ \:\ \mathrm{cm}$. JOI's height has increased by $5\ \:\ \mathrm{cm}$ over the past year, so output $ 5 $.

见题面 Input 部分

见题面 Output 部分