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TWEET # Untitled a guest Mar 31st, 2020 63 Never
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1. import sys
2. a = []
3. for i in range(8):
4.     a.append(list(map(int, input().split())))
5. for i in range(7):
6.     mult = True
7.     for j in range(7):
8.         if a[i][j] // abs(a[i][j]) != a[i][j + 1] // abs(a[i][j + 1]):
9.             mult = False
10.     if mult == True:
11.         continue
12.     else:
13.         for j in range(8):
14.             if a[i][j] < 0:
15.                 tmp1 = a[i + 1][j]
16.                 tmp2 = a[i][j]
17.                 a[i][j] = tmp1
18.                 a[i + 1][j] = tmp2
19.                 mult1 = True
20.                 for k in range(7):
21.                     if a[i][k] // abs(a[i][k]) != a[i][k + 1] // abs(a[i][k + 1]):
22.                         mult1 = False
23.                 if mult1 == True:
24.                     break
25.                 else:
26.                     if j == 7:
27.                         print("NO")
28.                         sys.exit(0)
29. print("YES")
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