mov rdx,32
mov rsi,rsp
xor rax,rax
mov rdi,rax
syscall
mov byte [-1+rsp+rax],48
mov rdx,rax
xor rax,rax
cmp byte [rsp],48
sete al
sub rdx,rax
mov rax,1
mov rdi,rax
syscall
xor rdi,rdi
mov rax,60
syscall