Create a function that takes a string and an integer (`n`).
The function should return a string that repeats the input string `n` number of times.
If anything other than a string is passed in you should return `"Not a string"`
## Example
```
"Hi", 2 --> "HiHi"
1234, 5 --> "Not a string"
```
repeat_it=lambda s,n:s*n if type(s) is str else 'Not a string'
repeat_it=lambda s,n:s*n if type(s) is str else 'Not a string'