Inspect each argument and decide whether its round, square, and curly brackets are paired up and nested in the correct order.

• For every argument from argv[1] onward, print OK followed by a newline when all brackets are properly matched and nested, otherwise print Error followed by a newline.
• The three pairs to validate are (), [], and {}. Every character that is not one of these six bracket symbols must be ignored.
• A string that contains no brackets at all is considered valid.
• When the program is launched without any argument (argc is 1), print wrong number of arguments followed by a newline and exit.

Inspect each argument and decide whether its round, square, and curly brackets are paired up and nested in the correct order.

• For every argument from argv[1] onward, print OK followed by a newline when all brackets are properly matched and nested, otherwise print Error followed by a newline.
• The three pairs to validate are (), [], and {}. Every character that is not one of these six bracket symbols must be ignored.
• A string that contains no brackets at all is considered valid.
• When the program is launched without any argument (argc is 1), print wrong number of arguments followed by a newline and exit.