Dec26

@leapfrog-dipendra @adhpawal @anishmanandhar @bhuwang 
Not a necessary thing to do. But using `cities.length()` will always execute the *length* function when jumping to new index in for loop. So, it is advisable to use , 

`int length=cities.length();`
`for (int i = 0; i < length ; i++) {`

instead.