`0-`

terminated string of `1000`

characters, you need `1001`

of them).Then you need the length of the string, say

`len`

.Eventually set

`start = 0`

and make a loop while (`len >=1`

) , at each iteration- output
`len`

characters, starting from`start`

. - increment
`start`

. - decrement twice
`len`

∴Balboos,GHB28-Feb-18 7:53amSolving problems yourself is the whole point of it, at least for those who actually wish to learn.