Having an EOF error tried many things no use(python)

Question

While using input function I'm getting an EOF error plz help me its my first calculator project
while True :
print ("enter add to add")
print ("enter substract to substract")

z = input(": ")

if z == "add":
Num1 = (float(input("Enter number:")))
Num2 = (float(input("another numer:")))
Result=(Num1 + Num2 )
print(Result )''

Answer 1

You need to give all the inputs at once in sololearn

Like

add
5
6
break(I mean some condition for breaking out of while loop)