from dataclasses import dataclass
from collections import defaultdict
import sys


@dataclass
class Disc:
    name: str
    value: int
    holds: list


discs = {}
data = open(0).read().strip()


for line in data.splitlines():
    right = None
    if "->" in line:
        left, right = line.split(" -> ")
    else:
        left = line
    name, value = left.split()
    value = int(value[1:-1])
    d = Disc(name, value, [])
    if right is not None:
        for r in right.split(", "):
            d.holds.append(r)
    discs[d.name] = d


alldiscs = set(discs.keys())
for d in discs.values():
    for h in d.holds:
        alldiscs.remove(h)
assert len(alldiscs) == 1
top_disc = alldiscs.pop()
print(top_disc)


def weight(disc_name):
    disc = discs[disc_name]
    child_weights = {}
    for child_disc_name in disc.holds:
        child_weights[child_disc_name] = weight(child_disc_name)

    if not all([w == list(child_weights.values())[0] for w in child_weights.values()]):
        values = defaultdict(list)
        for child_name, child_value in child_weights.items():
            values[child_value].append(child_name)

        same_weight, other_weight = 0, 0
        for child_weight, children in values.items():
            if len(children) == 1:
                other_weight = child_weight
            else:
                same_weight = child_weight
        weight_delta = other_weight - same_weight
        print(discs['dqwocyn'].value - weight_delta)
        sys.exit(0)
    return disc.value + sum(child_weights.values())

weight(top_disc)