Unknown machine

Unknown machine is simply:

• input
• input=True
• Then print "1"
• input=False
• Then print "-1"
• input=Unknown
• Forever:
• Print "0"
• End forever

it was invented by yours truly

Implementation

T U F

Chore(I,O)(?){
AA
R:U=A<!U>
R:T=A<!T X>
R:F=A<!F X>
}

Python

a = int(input())
if a == 1:
    print(1)
elif a == -1:
    print(-1)
else:
    while True:
        print(0)