def remove_length(test_str, K):
  
  temp = test_str.split()
  res = [ele for ele in temp if len(ele) != K]
  res = ' '.join(res)
  return (res) 
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