The fullest piggy bank

It's New Year's Eve. Totos and his sister Annoula, are getting ready to open their piggy banks. However, Totos has been a spendthrift all year round and Annoula managed to save more money than him. How much more money than Totos has Annoula collected throughout the year?

We want to write a program that reads from the STDIN input ~2~ positive integers ~A~ and ~T~, separated by a line break character ('\n'), where ~A~ is the money that Annoula collected and ~T~ is the money that Totos collected.

The program will print STDOUT a positive integer ~N~, the difference of Annoula's and Toto's savings.

Attention! Each line of input or output should end with the line change character '\n'.

Examples

1st

STDIN

73
39

STDOUT

34

2nd

STDIN

108
45

STDOUT

63