Given text:
heTfl g as iicpCTo{7F4NRP051N5_16_35P3X51N3_V6E5926A}4
and a hint that it is worth breaking this text into blocks of 3 and seeing in what order the characters were rearranged.
In the first block, the word “The” is clearly visible:
213 123
heT --> The
Following this principle, I divide the entire text into blocks of 3 characters and form 2 columns: with mixed and correct order:
231 123 look at the last --> first --> middle
heT The
fl fl
g a ag
s i is
icp pic
CTo oCT
{7F F{7
4NR R4N
P05 5P0
1N5 51N
_16 6_1
_35 5_3
P3X XP3
51N N51
3_V V3_
6E5 56E
926 692
A}4 4A}
The flag is picoCTF{7R4N5P051N6_15_3XP3N51V3_56E6924A}