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 (1.42.0) (judge verdict: Runtime Error)

use proconio::{fastout, input};

#[fastout]
fn main() {
    input! {x: usize};

    if x == 2 || x == 3 {
        println!("{}", x)
    } else {
        for i in x..10000000000 {
            let mut k = true;
            let mut j = 3;
            while j <= (i as f64).sqrt() as usize + 2 {
                if i % j == 0 || i % 2 == 0 {
                    k = false;
                    break;
                }
                j += 2;
            }
            if k {
                println!("{}", i);
                break;
            }
        }
    }
}