import time

ten_million  = 10000000
ten_thousand = 10000
one_thousand = 1000

start = time.time()
for item in range(one_thousand):
    print item
end = time.time()
first = end - start

start = time.time()
s = ''
for item in range(ten_thousand):
    s = s + str(item) + '\n'
print s
end = time.time()
second = end - start

print first
print second