# 命 令 执 行
# reset reset what
# reset board board fault
# board add where to add
# board delete no board at all
# reboot backplane impossible
# backplane abort install first
# he he unknown comma
all_in = ['reset board', 'board add', 'board delete', 'reboot backplane', 'backplane abort']
all_out = ['board fault', 'where to add', 'no board at all', 'impossible', 'install first']
while True:
try:
s = input().strip().split()
l = len(s)
if l == 1:
if 'reset'.startswith(s[0]):
print('reset what')
else:
print('unknown command')
elif l == 2:
flag = [] # 记录匹配到的命令在all_in中的索引，且当仅当len(flag)==1时，输出相应all_out下标的输出值
for i in all_in:
j = i.split()
if j[0].startswith(s[0]) and j[1].startswith(s[1]):
flag.append(all_in.index(i))
if len(flag) == 1:
print(all_out[flag[0]])
else:
print('unknown command')
else:
print('unknown command')
except:
break
