number1 = 10
number2 = 90
number3 = -78
sum = number1 + number2 + number3
print("sum:",sum)
sample = "HELLO"
print ( sample[0])
print (sample[1])
print ( sample[2])
print ( sample[3])
print ( sample[4])
print ( sample[-5])
print ( sample[-4])
print ( sample[-3])
print ( sample[-2])
print ( sample[-1])
print ( sample[-6])

