#advent of code 2020
#day 19
import re

def FindRule(r,d):
	if d >20: return "";
	elif type(rules[r]) == str:
		return rules[r];
	else:
		suboptions = [];
		for subset in rules[r]:
			subopt = "(";
			for sr in subset:
				subopt += FindRule(sr,d+1);
			subopt += ")";
			suboptions.append(subopt);
		return "(" + "|".join(suboptions) + ")";

rules = dict();
PuzzleInput = open("19.in","r").read().split("\n\n");
rules_raw = PuzzleInput[0].split("\n");
messages = PuzzleInput[1].split("\n");
for rule in rules_raw:
	rule_i, rule_vals = rule.split(": ");
	rule_i = int(rule_i);
	if rule_vals[0] == '"':
		rules[rule_i] = rule_vals[1];
	else:
		rules[rule_i] = [[int(r) for r in subrule.split(" ")] for subrule in rule_vals.split(" | ")];

TotalRule = "";
TotalRule = FindRule(0,0);
regsearch = re.compile(TotalRule);

p1 = 0;
for message in messages:
	message = message.replace("\n","");
	regfind = regsearch.fullmatch(message);
	if regfind != None:
		p1+=1;
	
print("part 1 =",p1);
#part 2: change of rules 8 and 11
rules[8] = [[42], [42, 8]];
rules[11] = [[42,31], [42,11,31]];
TotalRule = "";
TotalRule = FindRule(0,0);
p2 = 0;
for countdown,message in enumerate(messages):
	#print(len(messages) - countdown, len(messages));
	message = message.replace("\n","");
	regfind = re.findall(TotalRule+"+",message);
	if regfind:
		for x in regfind: 
			if message in x:
				p2+=1;
				break;
print("part 2 =",p2);