I have an Index that is generated as below:

```
Flag = ["A", "B", "C"]
Ind = cmp.(Flag, "A")
```

The results:

```
3-element Vector{Int64}:
0
1
1
```

However, what I need is to find where the "A"s are, so I want the inverse values of Ind. I tried both `!Ind`

and `.!Ind`

, unfortunately, neither of them works. There must be a way to inverse these Boolean values in Julia, am I right?