for i in range(int(input())):
L = input().split()
D = []
for i in L:
h,m = map(int, i.split(':'))
a = ((h % 12) * 30 + m / 2) % 360
b = m * 6
deg = max(a,b) - min(a,b)
D.append([min(deg, 360-deg), i])
D.sort()
print(D[2][1])