import os

# Open the listS
instancefile = open('instances', 'r')
lbfile = open('loadbalancers', 'r')
# Create Python lists
with instancefile as f:
    instances = [x.strip('\n') for x in f.readlines()]
with lbfile as f:
    loadbalancers = [x.strip('\n') for x in f.readlines()]

for lb in loadbalancers:
	for i in instances:
		command = str("elb-register-instances-with-lb " + lb + " --instances " + i)
		os.system(command)