Valid Arithmetic Expression Checker

Given an arithmetic expression as a string, determine whether it is valid under the following rules:

• The expression consists only of non-negative integers and the operators +, -, *, and /.
• The expression must start and end with a digit.
• There cannot be consecutive operators.
• Operands must not have leading zeros unless the operand is exactly 0.
• Division by zero is not allowed.

Your task is to read the expression from standard input and print True if the expression is valid and False otherwise.

Note: If the expression is empty, it is considered invalid.

inputFormat

Input is read from standard input (stdin) and consists of a single line containing the arithmetic expression string.

outputFormat

Output to standard output (stdout) a single line: either True if the expression is valid or False otherwise.## sample

12+34*5-6/2

True