The program that takes an undefined number of strings in arguments. For each argument, the program prints on the standard output "OK" followed by a newline if the expression is correctly bracketed, otherwise it prints "Error" followed by a newline. Symbols considered as 'brackets' are brackets '(' and ')', square brackets '[' and ']'and braces '{' and '}'. Every other symbols are simply ignored. An opening bracket must always be closed by the good closing bracket in the correct order. A string which not contains any bracket is considered as a correctly bracketed string. If there is no arguments, the program prints a newline only.
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