# Problem F

Kitten on a Tree

## Input

The input is a description of a single tree. The first line
contains an integer $K$,
denoting the branch on which the kitten got stuck. The next
lines each contain two or more integers $a, b_1, b_2, \ldots $. Each such line
denotes a branching: the kitten can reach $a$ from $b_1, b_2, \ldots $ on its way down.
Thus, $a$ will be closer
to the root than any of the $b_
i$. The description ends with a line containing
`-1`. Each branch $b_ i$ will appear on exactly one
line. All branch numbers are in the range $1..100$, though not necessarily
contiguous. You are guaranteed that there is a path from every
listed branch to the root. The kitten will sit on a branch that
has a number that is different than the root.

The illustration above corresponds to the sample input.

## Output

Output the path to the ground, starting with the branch on which the kitten sits.

Sample Input 1 | Sample Output 1 |
---|---|

14 25 24 4 3 1 2 13 9 4 11 10 20 8 7 32 10 21 23 13 19 32 22 19 12 5 14 17 30 14 6 15 16 30 18 31 29 24 23 26 26 27 28 -1 |
14 19 23 24 25 |