while True: try: n=int(input()) line1=input() line2=input() res=1 if line2[-1]=='X': print(-1) break if n==1: print(1) break for i in range(1,n): temp=0 if line1[i]=='.': temp+=1 if line2[i]=='.': temp+=1 if temp==0: print(-1) break res*=temp print(res) except: break
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