Problem:
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

Solution in Kotlin (1.3.71) (judge verdict: Accepted)

fun main() {
    val input2 = rspint()
    function(input2[0], input2[1])
}

fun function(in1: Int, in2: Int) {
    if (in1 > in2)
        println("safe")
    else
        println("unsafe")
}

inline fun rsp() = readLine()!!.split(" ")

inline fun rspint() = rsp().map(String::toInt)