not dh       ; sys_read count = edx = 65280
sub esp,edx  ; allocate 65280 bytes on stack
 
mov al,3     ; 0x03 = "read" syscall
mov ecx,esp  ; sys_read buf = ecx = stack pointer
int 0x80     ; eax = sys_read(stdin, esp, 65280)
 
add ecx,eax  ; add read bytes to stack pointer
 
inc ebx      ; sys_write fd = 1 = stdout
mov edx,ebx  ; sys_write count = 1
 
reverse:
dec ecx      ;
cmp ecx,esp  ; check if we've gone too far
jl done      ;
 
mov al,4     ; 0x04 = "write" syscall
int 0x80     ; eax = sys_write(stdout, ecx, 1)
 
jmp reverse
 
done:

bm90IGRoICAgICAgIDsgc3lzX3JlYWQgY291bnQgPSBlZHggPSA2NTI4MApzdWIgZXNwLGVkeCAgOyBhbGxvY2F0ZSA2NTI4MCBieXRlcyBvbiBzdGFjawoKbW92IGFsLDMgICAgIDsgMHgwMyA9ICJyZWFkIiBzeXNjYWxsCm1vdiBlY3gsZXNwICA7IHN5c19yZWFkIGJ1ZiA9IGVjeCA9IHN0YWNrIHBvaW50ZXIKaW50IDB4ODAgICAgIDsgZWF4ID0gc3lzX3JlYWQoc3RkaW4sIGVzcCwgNjUyODApCgphZGQgZWN4LGVheCAgOyBhZGQgcmVhZCBieXRlcyB0byBzdGFjayBwb2ludGVyCgppbmMgZWJ4ICAgICAgOyBzeXNfd3JpdGUgZmQgPSAxID0gc3Rkb3V0Cm1vdiBlZHgsZWJ4ICA7IHN5c193cml0ZSBjb3VudCA9IDEKCnJldmVyc2U6CmRlYyBlY3ggICAgICA7CmNtcCBlY3gsZXNwICA7IGNoZWNrIGlmIHdlJ3ZlIGdvbmUgdG9vIGZhcgpqbCBkb25lICAgICAgOwoKbW92IGFsLDQgICAgIDsgMHgwNCA9ICJ3cml0ZSIgc3lzY2FsbAppbnQgMHg4MCAgICAgOyBlYXggPSBzeXNfd3JpdGUoc3Rkb3V0LCBlY3gsIDEpCgpqbXAgcmV2ZXJzZQoKZG9uZTo=

QSBtYW4gYSBwbGFuIGEgY2FuYWwgUGFuYW1h

A man a plan a canal Panama