Balanced Brackets

Given a string consisting solely of the characters ('), (')', '{','}', '[' and ']', determine if the sequence of brackets is balanced.

A string is balanced if:

1. Every opening bracket has a corresponding closing bracket.
2. Brackets are closed in the correct order. For example, {[()]} is balanced, but {[(])} is not.

The input will be supplied via standard input, and the result must be printed on the standard output.

inputFormat

The input consists of a single line containing a string of brackets. The string will contain only the characters ('), (')', '{','}', '[' and ']'.

outputFormat

Print a single line: YES if the string of brackets is balanced, and NO otherwise.

## sample

{[()]}

YES

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