# apply a "curve" to each grade

grades = [90,100,70,45,76,84,93,21,36,99,100]

# start iterating through list
# check in which range each grade lies
# and add to appropriate counter
for i in range(0,len(grades)):
    if grades[i] >= 90:
        continue
    elif 80 <= grades[i] < 90:
        grades[i] += 2
    elif 70 <= grades[i] <= 80:
        grades[i] += 5
    else:
        grades[i] += 8

print("Updated grades: ", grades)