Game of Thrones - I

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    s = input() s = list(s) liss = [0]26 for char in s: if(liss[ord(char)-ord('a')]==0): liss[ord(char)-ord('a')]+=1 else: liss[ord(char)-ord('a')]-=1 total = sum(map(abs,liss)) if(total<=1): print("YES") else: print("NO")