# заводим словарь типа {номер машины : номер парковочного места}

S_INP = " drove into place "
S_OUT = " drove out"
S_LOOK = "look at "

Place = dict()

n = int(input())
for i in range(n) :
    s = input()
    ainp = s.find(S_INP)
    aout = s.find(S_OUT)

    if ainp != -1 :
        auto_num = s[0:ainp]
        place_num = s[ainp+len(S_INP):]
        Place[auto_num] = place_num
#        print(auto_num, place_num)
    elif aout != -1 :
        auto_num = s[0:aout]
#        print(auto_num)
        del Place[auto_num]
    else : # look at
        auto_num = s[len(S_LOOK):]
#        print(auto_num)
        if auto_num in Place.keys() :
            print(Place[auto_num])
        else :
            print("Not here")