One test has data in one line, but in term wrote:

Input

The first string of input contains integer N - quantity of
computers. The other successive strings (N-1) contain
protocol.

Output

Output contains ordinal numbers of the determined net
centers in ascending order.

Sample Input

5
1
1
2
2

> One test has data in one line, but in term wrote:
>
> Input
>
> The first string of input contains integer N - quantity
of
> computers. The other successive strings (N-1) contain
> protocol.
>
> Output
>
> Output contains ordinal numbers of the determined net
> centers in ascending order.
>
> Sample Input
>
> 5
> 1
> 1
> 2
> 2

You're right! The problrm text was erroneous, some tests
look like

10000
 1  1  1  1  2  2  2  2  2  3  3  3  3  3  4  4  4  4  4
5  5  5  5  5.....
....

I fixed the problem text and sample input.!

I recommend to use the reading algorithm, that doesn't
depend on number of spaces and line breaks.