def lower_ctr(str):
      
      lower_ctr= 0
      for i in range(len(str)):
          if str[i] >= 'a' and str[i] <= 'z': lower_ctr += 1     
      return  lower_ctr
def is_not_prime(n):
    import math
    
    result = False
    for i in range(2,int(math.sqrt(n)) + 1):
        if n % i == 0:
            result = True
    return result