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a = [i for i in range(3)]
print(a)
a = [i for i in range(2, -1, -1)]
print(a)
s = "nguyen to son"
length = len(s)
for i in range(0, length):
print("%3d: %c" % (i, s[i]))
print()
for i in range(1, length+1, 1):
print("%3d: %c" % (-i, s[-i]))
print()
for i in range(length-1, -1, -1):
print("%3d: %c" % (i, s[i]))