1. View the code. The flag is stored inside inp[] array. The array has a length of 17 blocks.2. Let's restructure the array.
a = "LTR"b = "0D"c = "S1"
* inp[0] == a[2] -> R* inp[1] == a[1] -> T* inp[2] == a[0] -> L* inp[3] == "{" -> {* inp[4] + inp[5] == b[::-1] -> D0* inp[6] == "N" -> N* inp[7] == "T" -> T* inp[8] == chr(95) -> _* inp[9] + inp [10] == b[::-1]  -> D0* inp[11] + inp[12] + inp[13] == "TH" -> TH* inp[14] + inp[15] == c[::-1] -> 1S* inp[16] == "}" -> }
Reference:1. What is the meaning of “int(a[::-1])” in Python?[ https://stackoverflow.com/questions/31633635/what-is-the-meaning-of-inta-1-in-python/31633656 ]