import random
elements = ['A',
'A7',
'A777',
'14',
'F',
'1',
'277',
'H17',
'912']
count = 5
output = ''
prevRandom = -1
for x in range(0, count):
while True:
rndm = random.randint(0,len(elements)-1)
if (rndm != prevRandom):
prevRandom = rndm
break
# print(elements[rndm])
output += elements[rndm] + ','
print(output[:-1])