n = int(input())
nums={'0': 0, '1': 0, '2': 0, '3': 0, '4': 0, '5': 0, '6': 0, '7': 0, '8': 0, '9': 0}

for i in range(n):
    data = input().split()
    if data[4]=="YES":
        for j in range(4):
            nums[data[j]]+=1
    else:
        for j in range(4):
            nums[data[j]]-=1


dict={}
for key,value in nums.items():
    dict[value]=key
    

array=[]
for key in dict:
    array.append(key)
    
print(dict[max(array)])