p02699 AtCoder Beginner Contest 164 - Sheep and Wolves
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`.

Constraints

* 1 \leq S \leq 100
* 1 \leq W \leq 100

Input

Input is given from Standard Input in the following format:


S W


Output

If the wolves will attack the sheep, print `unsafe`; otherwise, print `safe`.

Examples

Input

4 5


Output

unsafe


Input

100 2


Output

safe


Input

10 10


Output

unsafe
```python
s,w = map(int, input().split())
print("safe" if w<s else "unsafe")
```