"""
review

while loop
"""

list1 = [1,2,3,4]

index = 0

# list1[index]
# index = 0..3
while index < 4:
    print(list1[index])
    # index = index + 1
    index += 1


# infinite loop
while True:
    # your code goes here

    flag = True
    if flag:
        break


# break, continue
