Parenthesis Matching Check

Problem Background

Special for beginners, ^_^

Problem Description

Suppose an expression may contain two kinds of brackets: parentheses () and square brackets [], nested in any order, such as ( [ ] ( ) ) or [ ( [ ] [ ] ) ] which are correct matchings, while [ ( ] ), ( [ ] ( ), or ( ( ) ) ) are incorrect matchings.

The problem now is to check whether the brackets in a given expression are correctly matched.

Input a string containing only parentheses and square brackets, and determine whether the brackets match. If they match, output OK; otherwise output Wrong.

Input Format

A single line of characters (fewer than $255$ characters).

Output Format

If matched, output OK; otherwise output Wrong. These words must be printed exactly as shown (do not translate).

Sample Input 1

[(])

Sample Output 1

Wrong

Sample Input 2

[([][])]

Sample Output 2

OK

Constraints

Time limit 1s, memory limit 1024KiB for each test case.