```$ file riskv_and_reward riskv_and_reward: ELF 64-bit LSB executable, UCB RISC-V, version 1 (SYSV), statically linked, stripped$ readelf -h riskv_and_reward ELF Header:  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00   Class:                             ELF64  Data:                              2's complement, little endian  Version:                           1 (current)  OS/ABI:                            UNIX - System V  ABI Version:                       0  Type:                              EXEC (Executable file)  Machine:                           <unknown>: 0xf3  Version:                           0x1  Entry point address:               0x121c8  Start of program headers:          64 (bytes into file)  Start of section headers:          16688 (bytes into file)  Flags:                             0x4  Size of this header:               64 (bytes)  Size of program headers:           56 (bytes)  Number of program headers:         3  Size of section headers:           64 (bytes)  Number of section headers:         13  Section header string table index: 12```File says its RISC-V, readelf says its machine: uknown. Checking wikipedia says 0xf3 is risc-v.And... we can't launch it, since it is different arch. With some googling we've found: https://github.com/riscv/riscv-qemu And so we launched it with docker:```$ sudo docker run --privileged -v /home:/home -it sorear/fedora-riscv-wip[root@4950793c6382 /]# cd /home/dc[root@4950793c6382 dc]# ./riskv_and_reward BITSCTF{s0m3_r1sc5_4r3_w0rth_1t}```