Stop

Stop is an esoteric programming language invented by User:A.

,	inputs the register.
:	starts a do...while with register==1, printing the register while the condition is true.

Example

Truth-machine

,:

Python interpreter

def stop(code):
  reg = 0
  for i, c in enumerate(code):
    if c == ",":
      try:
        reg = int(input("> "))
      except ValueError:
        reg = 0
    elif c == ":":
      while True:
        print(reg)
        if reg != 1:
          break