Namespaces

def getarg(namesp, arg):
    if namesp in var and arg in var[namesp]:
        return namesp
    else:
        if namesp not in par or par[namesp] == None:
            return None
        else:
            namesp = par[namesp]
            return getarg(namesp, arg)

par = {'global': None}
var = {'global': []}
for i in range(int(input())):
    comand, namesp, arg = input().split()
    if comand == 'create':
        par[namesp] = arg
    if comand == 'add':
        if namesp not in var:
            var[namesp] = []
        var[namesp] += [arg]
    if comand == 'get':
        print(getarg(namesp, arg))