list indexing and slicing

Elements in the list can be accessed with [] brackets. We can slice lists like strings with [] as well:
l = [77, 0, -1, 4, 2, 1, 5, -2]
print(l)        # [77, 0, -1, 4, 2, 1, 5, -2]
print(l[2])     # -1
print(l[1: 3])  # [0, -1]
print(l[1: 4])  # [0, -1, 4]
print(l[1: 5])  # [0, -1, 4, 2]
print(l[2: 3])  # [-1]
print(l[:2])    # [77, 0]
print(l[2:])    # [-1, 4, 2, 1, 5, -2]

Challenge

Declare a variable called alphabet that keeps all the uppercase letters of the English language: alphabet = ['A', 'B', ..., 'Z']. The input contains a single integer n. The program should print the first n letters in the alphabet. It’s guaranteed that 1 ≤ n ≤ 26.
Input
Output
1
['A']
2
['A', 'B']
 
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