input: Write a function to determine the count of numeric and alphabetic characters in a given string.  
  assert dig_let("python") == (6, 0)  
  assert dig_let("program") == (7, 0)  
  assert dig_let("python3.0") == (6, 2)
output: def dig_let(s):
      num_count = sum(c.isdigit() for c in s)
      alpha_count = sum(c.isalpha() for c in s)
      return (alpha_count, num_count)