n=int(input())
ls=[]
for i in range(n):
    la=input().split()
    ls.append(la)
for i in range(n):
    for j in range(i+1,n):
        diff = [int(ls[i][k])-int(ls[j][k]) for k in range(1,3)]
        if all(-5 <= di <= 5 for di in diff) and abs(sum(diff)) <= 10:
            print(ls[i][0],ls[j][0])