Problem Statement

Ame-kun is going to help his older sister Yuki, who runs "yukicoder".

The job assigned to Ame-kun this time is to create an easy problem to be used as the first problem of a contest.

So Ame-kun decided to create the following A + B problem.

Problem Statement

Given an integer $A$ on the first line and an integer $B$ on the second line, print $A + B$.

Input

$A$
$B$

All inputs are integers and satisfy the following constraints.

• $0 \leq A, B \leq 12345$

Output

Print the result of $A + B$ on one line.

Print a newline at the end.

Ame-kun had smoothly made everything up to the test cases, but it turned out that the program generating the test cases was buggy.

So Ame-kun decided to write a program that checks whether a test case satisfies the format and constraints of the problem above.

Note that a case with leading zeros (unnecessary zeros continuing from the beginning of the string) is also considered not to satisfy the format.

Input

$A$
$B$

A string $A$ is given on the first line, and a string $B$ on the second line.

Each string consists only of half-width alphanumeric characters (0-9, A-Z, a-z) and contains no spaces or symbols such as + or -.

The length of each string is guaranteed to be at least 1 and at most 5.

Output

Print "OK" if the input satisfies the format and constraints of the A + B problem above, and "NG" if it does not.

Print a newline at the end.

Sample

123
4eF

NG

21000
00012

NG

FFFF
0x10

NG

0
12345

OK