import statistics
a=int(input())
c=[0,1,2,3,4,5,6,7,8,9]
d=[]
e=[]
for i in range(a):
    b=input().split()
    if b[4]=="NO":
        d.append(int(b[0]))
        d.append(int(b[1]))
        d.append(int(b[2]))
        d.append(int(b[3]))
    else:
        e.append(int(b[0]))
        e.append(int(b[1]))
        e.append(int(b[2]))
        e.append(int(b[3]))

if len(d)==12:
    for i in c:
        if i not in d:
            print(i)
else:
    for i in e:
        if (e.count(i)>=len(e)//4) and (i not in d):
            print(i)
            break