class Solution:
    def addMinimum(self, word: str) -> int:
        word2 = []
        if word[0] == 'a':
            operations = 0
        
        elif word[0] == 'b':
            operations = 1
            word2.append('a')
        
        elif word[0] == 'c':
            operations = 2
            word2.append('a')
            word2.append('b')

        
        for i in word:
            if len(word2) == 0:
                word2.append(i)
                continue
            
            p = word2[-1]
            if (p == 'a' and i == 'b') or (p == 'b' and i == 'c') or (p == 'c' and i == 'a'):
                word2.append(i)
                continue
            
            elif p == i:
                word2.append(i)
                operations += 2
            
            elif (p == 'a' and i == 'c') or (p == 'b' and i == 'a') or (p == 'c' and i == 'b'):
                word2.append(i)
                operations += 1
        
        if word2[-1] == 'a':
            operations += 2
        elif word2[-1] == 'b':
            operations += 1
        
        return operations