编辑代码

a=int(input())
b=int(input())
c=int(input())
if a+b==c:
    print('+')
elif a-b==c:
    print('-')
elif a*b==c:
    print('*')
elif a/b==c:
    print('/')
elif a//b==c:
    print('//')
elif a%b==c:
    print('%')
else:
    print('Error')