n = int(input())

ly = [str(i) for i in range(10)]
ln = []
for i in range(n):
    a, b, c, d, r = input().split()
    if r == 'NO':
        ln.append(a)
        ln.append(b)
        ln.append(c)
        ln.append(d)
    else:
        ly.append(a)
        ly.append(b)
        ly.append(c)
        ly.append(d)
        
ln = sorted(set(ln))

for i in ln:
    if i in ly:
        ly.remove(i)

c = {}
for i in ly:
    if not i in c:
        c[i] = 1
    else:
        c[i] += 1

x = max(c, key=c.get)
print(x)