(gdb) r < b.txt
Starting program: /root/Documents/vuln < b.txt
What is your name?
Hey Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab, you're harmless, aren't you?

Program received signal SIGSEGV, Segmentation fault.
0x41346241 in ?? ()