fibonacci ***Time limit exceeded***

[frequency]

f=[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
for i in range (9999):
    f.append(f[-1]+f[-2])
user_input=input()
while user_input!="END":
    user_input=int(user_input)
    print (f[user_input-1])
    user_input=input()

I actually removed the wrongfuly placed 9 there. Got it working