public static int makeAnagram(string a, string b)
    {
        Dictionary<char, int> aMap = new();
        Dictionary<char, int> bMap = new();
        int charsToDelete = 0;
        
        for(int i = 0; i < a.Length; i++)
        {
            if(!aMap.TryAdd(a[i], 1))
            {
                aMap[a[i]] += 1;
            }
        }
        
        for(int j = 0; j < b.Length; j++)
        {
            if(!bMap.TryAdd(b[j], 1))
            {
                bMap[b[j]] += 1;
            }
        }
        
        foreach(char key in aMap.Keys)
        {
            int aCount = aMap[key];
            int bCount = 0;
            bMap.TryGetValue(key, out bCount);
            
            charsToDelete += Math.Abs(aCount - bCount);
        }
        
        foreach(char key in bMap.Keys)
        {
            int bCount = bMap[key];
            int aCount = 0;
            aMap.TryGetValue(key, out aCount);
            
            if(aCount == 0)
            {
                charsToDelete += Math.Abs(bCount);
            }
            
        }
        
        return charsToDelete;
    }