x = 7
if (-9 <= x) and (x <= 9):
    print("Just one digit")
if (x < -9) or (x > 9):
    print("Multiple digits")

###
    
grade = 32
if grade >= 90:
    print("A")
elif grade >= 80:
    print("B")
elif grade >= 70:
    print("C")
elif grade >= 60:
    print("D")
else:
    print("R")

###

def average(total, n):
    return total * n
assert(average(100, 10) == 10.0)