import sys

class FSA:
    def __init__(self):
        self.initial_state = '0'
        self.final_states = set()
        self.transitions = dict()
        self.alphabet = set()

    def add_transition(self, state_from, state_to, symbol):
        if state_from in self.transitions.keys():
            if symbol not in self.transitions[state_from].keys():
                self.transitions[state_from][symbol] = {state_to}
            else:
                self.transitions[state_from][symbol] |= {state_to}
        else:
            self.transitions[state_from] = dict()
            self.transitions[state_from][symbol] = {state_to}
    def add_final_state(self, state):
        self.final_states.add(state)
    def get_all_paths(self):
        paths = []
        stack = [('', '0')]
        while stack:
            current_path, current_state = stack.pop()
            if current_state in self.final_states:
                paths.append(current_path)
            if current_state in self.transitions:
                for symbol, states in self.transitions[current_state].items():
                    stack.extend((current_path + symbol, state) for state in states)
        return sorted(paths)

fsa = FSA()

for line in sys.stdin:
    parts = line.strip().split('\t')
    if parts == ['']: break
    [fsa.add_transition(parts[0], parts[1], parts[2]) for parts in [parts]] if len(parts) == 3 else fsa.add_final_state(parts[0])
for path in fsa.get_all_paths():
    print(path)