789 B | 789 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
sys.setrecursionlimit(10**7)
BLANK = " "
#inp = input
inp = lambda : sys.stdin.readline().rstrip()
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 f(a, b):
ret = 0
for i in range(len(a)):
if a[i] == b[i]:
continue
ret += 1
return ret
def solve():
s = input()
w = ii()
l = [input() for _ in range(w)]
ans = 0
crt = 200
for i in range(w):
diff = f(l[i], s)
if diff < crt:
crt = diff
ans = i
p(l[ans])
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
ret = solve()