Consider the following code:

```
void main()
{
    int i = 0;
    char j[22] = "This is a long string", k[3];
    scanf("%2s", k);
    sprintf(j, k);
    for (; i < 21; printf("%c", j[i++]));
}

```

It is given that the output is: 

> 
> U%ae'$ffq` ong string
> 
> 
> 

What could be the input?

So I think it should be something like `%d` or `%x`. So it executes: `sprintf(j, "%x");` but there's no corresponding variable to this format. 

1. What does the function do in this case? It seems like an address
2. What could be the input? Is it `%x` or something else?