nums = [13,12,11,-8]

for element in nums:
    element += 10
    print(element)

print(nums)
print('-----------------')

for j in range(len(nums)):
    nums[j] += 10
    print(nums[j])

print(nums)
print('-----------------')

i = 0

while i < len(nums):
    print(nums[i])
    i += 1
print('-----------------')