101640: [AtCoder]ABC164 A - Sheep and Wolves

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

Score : $100$ points

Problem Statement

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.


Sample Input 1

4 5

Sample Output 1

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 Input 2

100 2

Sample Output 2

safe

Many a sheep drive away two wolves.


Sample Input 3

10 10

Sample Output 3

unsafe

Input

题意翻译

草原上有 $S$ 头羊,$W$ 头狼。如果 羊的数量比狼多,输出 `safe`,否则输出 `unsafe`。

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