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: Accepted)

use std::io::stdin;
use std::io::Error;
use std::io::Read;

#[derive(Debug)]
struct Input {
    a: Vec<u32>,
    k: u32,
}

fn handle_input(input_str: String) -> Result<Input, Error> {
    let mut iter = input_str.split_whitespace();
    let a: u32 = iter.next().unwrap().parse().unwrap();
    let b: u32 = iter.next().unwrap().parse().unwrap();
    let c: u32 = iter.next().unwrap().parse().unwrap();
    let d: u32 = iter.next().unwrap().parse().unwrap();
    let e: u32 = iter.next().unwrap().parse().unwrap();
    let k: u32 = iter.next().unwrap().parse().unwrap();
    let input = Input {
        a: vec![a, b, c, d, e],
        k: k,
    };
    Ok(input)
}

fn handle_output(input: Input) -> Result<String, Error> {
    for i in 0..5 {
        for j in i + 1..5 {
            if input.a[j] - input.a[i] > input.k {
                return Ok(":(".to_string());
            }
        }
    }
    Ok("Yay!".to_string())
}

fn main() {
    let mut input_str = String::new();
    let stdin = stdin();
    stdin.lock().read_to_string(&mut input_str).unwrap();
    let input = handle_input(input_str).unwrap();
    let output = handle_output(input).unwrap();
    println!("{}", output);
}