Problem:
﻿Score: 100 points

Problem Statement

In AtCoder city, there are five antennas standing in a straight line. They are called Antenna A, B, C, D and E from west to east, and their coordinates are a, b, c, d and e, respectively.

Two antennas can communicate directly if the distance between them is k or less, and they cannot if the distance is greater than k.

Determine if there exists a pair of antennas that cannot communicate directly.

Here, assume that the distance between two antennas at coordinates p and q (p < q) is q - p.

Constraints

a, b, c, d, e and k are integers between 0 and 123 (inclusive).

a < b < c < d < e

Input

Input is given from Standard Input in the following format:

a
b
c
d
e
k

Output

Print :( if there exists a pair of antennas that cannot communicate directly, and print Yay! if there is no such pair.

Sample Input 1

1
2
4
8
9
15

Sample Output 1

Yay!

In this case, there is no pair of antennas that cannot communicate directly, because:

the distance between A and B is 2 - 1 = 1

the distance between A and C is 4 - 1 = 3

the distance between A and D is 8 - 1 = 7

the distance between A and E is 9 - 1 = 8

the distance between B and C is 4 - 2 = 2

the distance between B and D is 8 - 2 = 6

the distance between B and E is 9 - 2 = 7

the distance between C and D is 8 - 4 = 4

the distance between C and E is 9 - 4 = 5

the distance between D and E is 9 - 8 = 1

and none of them is greater than 15. Thus, the correct output is Yay!.

Sample Input 2

15
18
26
35
36
18

Sample Output 2

:(

In this case, the distance between antennas A and D is 35 - 15 = 20 and exceeds 18, so they cannot communicate directly.
Thus, the correct output is :(.

Solution in Rust (1.15.1) (judge verdict: Wrong Answer)

use std::io;


fn read_line() -> String {
    let mut line = String::new();

    io::stdin().read_line(&mut line)
        .expect("Failed to read line");
    return line;
}
fn to_i(s: &str) -> i64 {
    return s.trim().parse()
        .expect("Please type a number!");
}

fn main() {

    let l1 = read_line();
    let l2 = read_line();
    let l3 = read_line();
    let l4 = read_line();
    let l5 = read_line();
    let l6 = read_line();
    let a: i64 = to_i(&l1);
    let b: i64 = to_i(&l2);
    let c: i64 = to_i(&l3);
    let d: i64 = to_i(&l4);
    let e: i64 = to_i(&l5);
    let k: i64 = to_i(&l6);

    let mut v = Vec::new();
    v.push(a);
    v.push(b);
    v.push(c);
    v.push(d);
    v.push(e);
    let n = v.len();
    let mut fail = false;
    for i in 0..n {
        for j in i+1..n {
            let l = v[j]-v[i];
            // println!("{} {} {}",i,j,l);
            if l>=k {
                fail = true;
                break;
            }
        }
    }
    
    if fail {
        print!(":(");
    } else {
        print!("Yay!");
    }
    


}