output_description: Print the answer.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      s_1 s_2 s_3
attempt: a, b, c = map(int, input().split())
  acnt = 0
  bcnt = 0
  ccnt = 0
  cnt = 0
  if a == b and a == c and a % 2 == 0:
      print(-1)
      exit()
  while a % 2 == 0 and b % 2 == 0 and c % 2 == 0:
      cnt += 1
      acnt = (b + c) // 2
      bcnt = (a + c) // 2
      ccnt = (a + b) // 2
      a = acnt
      b = bcnt
      c = ccnt
  print(cnt)
  
problem_description: Statement
  
  You are given three words s_1, s_2 and s_3, each composed of lowercase English
  letters, with spaces in between. Print the acronym formed from the uppercased
  initial letters of the words.
samples: [{"input": "atcoder beginner contest", "output": "ABC\n    \n\nThe initial letters of `atcoder`, `beginner` and `contest` are `a`, `b` and\n`c`. Uppercase and concatenate them to obtain `ABC`.\n\n* * *"}, {"input": "resident register number", "output": "RRN\n    \n\n* * *"}, {"input": "k nearest neighbor", "output": "KNN\n    \n\n* * *"}, {"input": "async layered coding", "output": "ALC"}]