output_description: Print the number of digits of a \+ b for each data set.
input_description: There are several test cases. Each test case consists of two non-negative
  integers a and _b_ which are separeted by a space in a line. The input
  terminates with EOF.
attempt: values = []
  x, y = [int(x) for x in input().split()]
  digit = 0
  sum = x + y
  while sum >= 1:
      sum //= 10
      digit += 1
  print(digit)
  
problem_description: Digit Number
  
  Write a program which computes the digit number of sum of two integers a and
  b.
samples: [{"input": "7\n    1 99\n    1000 999", "output": "3\n    4"}]