沈敬翔

1. a=input()
   
2. b=input()
   
3. 
   
4. if (len(a)>3 and len(a)<=20) and (len(b)>3 and len(b)<=20):
   
5.     print(len(a))
   
6.     print(len(b))
   
7.     c=a+b
   
8.     print(c[::-1])
   
9. else:
   
10.     print("error")

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