from collections import defaultdict
m = defaultdict(set)
m["YES"] = set("0123456789")
for _ in range(int(input())):
    a, b, c, d, r = input().split()
    if r == "YES":
        m["YES"] &= {a, b, c, d}
    if r == "NO":
        m["NO"] |= {a, b, c, d}
print((m["YES"] - m["NO"]).pop())