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- a=input()
- i=0
- k=0
- while i<(len(a)):
- if a[i]!="A" and k==0 :
- print(a[i],end="")
- elif a[i]=="A" :
- k+=1
- else:
- k-=1
- i+=1
- for x in range(k):
- print("A",end="")
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