Problem:
Score : 100 points

Problem Statement

Given are two strings S and T consisting of lowercase English letters. Concatenate T and S in this order, without space in between, and print the resulting string.

Constraints

S and T are strings consisting of lowercase English letters.

The lengths of S and T are between 1 and 100 (inclusive).

Input

Input is given from Standard Input in the following format:

S T

Output

Print the resulting string.

Sample Input 1

oder atc

Sample Output 1

atcoder

When S = oder and T = atc, concatenating T and S in this order results in atcoder.

Sample Input 2

humu humu

Sample Output 2

humuhumu

Solution in Rust (1.15.1) (judge verdict: Runtime Error)

use std::io::Read;

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    let mut it = buf.trim().split_whitespace();

    let n: usize = it.next().unwrap().parse().unwrap();
    let k: usize = it.next().unwrap().parse().unwrap();
    let r: u64 = it.next().unwrap().parse().unwrap();
    let s: u64 = it.next().unwrap().parse().unwrap();
    let p: u64 = it.next().unwrap().parse().unwrap();
    let t: Vec<char> = it.next().unwrap().chars().collect();

    let mut point: u64 = 0;
    let mut flag: Vec<usize> = Vec::new();

    for i in 0..n {
        if i < k {

        } else if t[i] != t[i - k] || flag.contains(&(i - k)) {

        } else {
            flag.push(i);
        }
    }

    println!("{}", point);
}