while True: try: a,b,c=map(int,input().split()) total=0 for i in range(a,c+1): if i%a==0 or i%b==0: total+=i if total>26: s=total-26 print(chr(s+65-1)) else: print(chr(total+65-1)) except: break
1. for i in range(a,c+1):2. s=total-26
1.是從1開始不是從a開始
2.有沒有想過total可能大於52?