5325: ABC164——Task A：Sheep and Wolves
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Description
There are $S$ sheep and $W$ wolves.
If the number of wolves is greater than or equal to that of sheep, the wolves will attack the sheep.
If the wolves will attack the sheep, print unsafe; otherwise, print safe.
If the number of wolves is greater than or equal to that of sheep, the wolves will attack the sheep.
If the wolves will attack the sheep, print unsafe; otherwise, print safe.
Input
Input is given from Standard Input in the following format:
$S\ W$
$S\ W$
Output
If the wolves will attack the sheep, print unsafe; otherwise, print safe.
Constraints
$1≤S≤100\\
1≤W≤100$
1≤W≤100$
Sample 1 Input
4 5
Sample 1 Output
unsafe
There are four sheep and five wolves. The number of wolves is not less than that of sheep, so they will attack them.
Sample 2 Input
100 2
Sample 2 Output
safe
Many a sheep drive away two wolves.
Sample 3 Input
10 10
Sample 3 Output
unsafe