1class RunewordsCalculator:
 2
 3    def __init__(self, runewords):
 4        self.runewords = runewords
 5        self.met_runes = []
 6        self.met_runewords = set()
 7    
 8    def add_runes(self, runes):
 9        self.met_runes.extend(runes)
10
11    def __iter__(self):
12        self.num = 0
13        return self
14    
15    def __next__(self):
16        
17        for key, value in self.runewords.items():
18            if key in self.met_runewords:
19                self.num += 1
20                continue
21
22            curr_rune_index = 0
23            curr_met_rune_index = 0
24            while True:
25                if curr_rune_index == len(value):
26                    self.met_runewords.add(key)
27                    return key
28                
29                if curr_met_rune_index == len(self.met_runes):
30                    break
31
32                if value[curr_rune_index] == self.met_runes[curr_met_rune_index]:
33                    curr_rune_index += 1
34                
35                curr_met_rune_index += 1
36
37        if self.num == len(self.runewords):
38            raise StopIteration