for tc in range(int(input())):
l = [input() for i in range(int(input()))]
k = input()
print(f"Data Set {tc + 1}:")
for i in l:
c = 0
for j in i:
if c == len(k):
break
if j.lower() == k[c].lower():
c += 1
if c == len(k):
print(i)