a=input('输入算式')
if a.count('+')+a.count('-')+a.count('*')+a.count('/')==1 and a.count('=')==1:
ss=a.split('=')[0]
ans=a.split('=')[1]
for i in '+-*/':
try:
s1=int(ss.split(i)[0])
s2=int(ss.split(i)[1])
ans=int(ans)
if i=='+':
if s1+s2==ans:
print('正确')
else:
print('错误')
break
if i=='-':
if s1-s2==ans:
print('正确')
else:
print('错误')
break
if i=='*':
if s1*s2==ans:
print('正确')
else:
print('错误')
break
if i=='/':
if s1/s2==ans:
print('正确')
else:
print('错误')
break
except:
pass
else:
print('无法识别')
else:
print('无法识别')