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def f(n): if n.endswith('0'): return "NO" else: x=0 a=len(n) for i in range(a): c=int(n[i])+int(n[a-1-i])+x if c<10: if c%2==0: return "NO" else: if c%2==0: return "NO" else: x=1 return "YES" print(f('6547'))
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