a = [0] *10
for k in range(int(input())):
    b = input().split()
    if b[-1] == "YES":
        for k in range(4):
            a[int(b[k])] += 1
    else:
        for k in range(4):
            a[int(b[k])] -= 1
         
print(a.index(max(a)))