output_description: Print the value A \times B as an integer.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      A B
attempt: sute = input()
  input_nums = input().split()
  
  output = 1
  
  x = map((lambda x: int(x)), input_nums)
  
  
  for num in x:
      output *= num
      if output > 10 ^ 18:
          output = -1
  
  if output <= -1:
      output = -1
  
  
  print(output)
  
problem_description: Statement
  
  Compute A \times B.
samples: [{"input": "2 5", "output": "10\n    \n\nWe have 2 \\times 5 = 10.\n\n* * *"}, {"input": "100 100", "output": "10000"}]