题解 | Letter Song ~ 致十年后的我们

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();

        String[] arr = new String[s.length()];

        for (int i = 0; i < s.length(); i++) {
            arr[i] = s.substring(i, i + 1);
            if (i == 2) {
                int a = Integer.parseInt(arr[i]);
                a = a + 1;
                arr[i] = Integer.toString(a);
            }
        }
        for (int i = 0; i < s.length(); i++) {
            System.out.print(arr[i]);
        }
    }
}