The flag is: ISCTF{part1_part2_part3}
example:
part1:aaa
part2:bbb
part3:!@#
flag:ISCTF{aaa_bbb_!@#}

-------------------------------------challenge-------------------------------------
part1:SUpXSEtaS1ROQlFYRTJZPQ==

part2:5c 75 35 33 5c 75 36 35 5c 75 36 35 5c 75 36 44 5c 75 37 33 5c 75 35 33 5c 75 33 30
