def primfacs():
   fl = open('1.txt')
   n_txt = fl.read()
   n= int(n_txt)
   i = 2
   primfac = []
   while i * i <= n:
       while n % i == 0:
           primfac.append(i)
           n = n // i
       i = i + 1
   if n > 1:
       primfac.append(n)
   return primfac
print (primfacs())

 while True:
   ,,,,