897 B | 897 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
dx = [-2, -1, 1, 2, -2 , -1, 1, 2]
dy = [1, 2, 2, 1, -1, -2, -2, -1]
l = [input() for i in range(5)]
flag = True
for i in range(5):
for j in range(5):
if l[i][j] == '.':
continue
for d in range(8):
ny = i + dy[d]
nx = j + dx[d]
if ny < 0 or nx < 0 or ny > 4 or nx > 4:
continue
if l[ny][nx] == 'k':
flag = False
break
print("valid" if flag else "invalid")
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
if t != 1:
input()
ret = solve()