n = int(input())
l = [[str(i), 1] for i in range(10)]
m = dict(l)

for i in range(n):
    a, b, c, d , r = input().split()
    if r == 'YES':
        m[a] += 1
        m[b] += 1
        m[c] += 1
        m[d] += 1
    else:
        m[a] = 0
        m[b] = 0
        m[c] = 0
        m[d] = 0

print(max(m, key=m.get))