ex2b

a = input("firstnum")
b = input("secondnum")
operation = input("op")
if operation == '+':
    print(a+b)
elif operation == '*':
    print(a*b)
elif operation == '/':
    if b == 0:
        print("division by 0")
    else:
    print(a/b)
elif operation == '%':
    if b == 0:
        print("division by 0")
    else:
    print(a%b)
else: