print("This program can be used to add and subtract")
x=int(input("x:"))
y=int(input("y:"))
print("Choose for addition :1 or subtraction 0")
z = int(input("z:"))

if z==1:
    print("Addition selected.")
    a= x+y
    print("The sum of ",y,"and",x,"is",a)
elif z ==0:
    print("Subtraction selected.")
    a= x-y
    print("The difference between ",y,"and",x,"is",a)
else:
    print("Kindly input either 1 or 0")