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: for i in input():
      i.sprit()
      a = int(i[i][0])
      b = int(i[i][1])
      temp = a + b
      x = 0
      while temp // (10**x) > 0:
          x += 1
      print(x)
  
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"}]