def first_repeated_word(str1):
  
  temp = set()
  for word in str1.split():
    if word in temp:
      return word;
    else:
      temp.add(word)
  return 'None'
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