# 抄了评论区比较稳的代码记一下
import sys
for line in sys.stdin:
s = line.split()
if s[0] in "reset" and len(s)==1:
print("reset what")
elif len(s)==2:
if s[0] in 're' and s[1]=='b':
print("unknown command")
elif s[0]=='b' and s[1]=='a':
print("unknown command")
elif s[0] in "reset" and s[1] in "board":
print("board fault")
elif s[0] in "board" and s[1] in "add":
print("where to add")
elif s[0] in "board" and s[1] in "delete":
print("no board at all")
elif s[0] in "reboot" and s[1] in "backplane":
print("impossible")
elif s[0] in "backplane" and s[1] in "abort":
print("install first")
else:
print("unknown command")
else:
print("unknown command")