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a = input() al = 'ABCDEFGH' idx11 = int(a[1]) idx12 = int(a[4]) idx21 = al.index(a[0])+1 idx22 = al.index(a[3])+1 if (abs(idx11-idx12)!=2 or abs(idx22-idx21)!=1) or(abs(idx11-idx12)!=2 or abs(idx22-idx21)!=1) : print('NO') else: print('YES')
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