缩写
缩写
https://www.nowcoder.com/questionTerminal/5082d54f177a4d469fbee358da014e1e?f=discussion
import java.util.Scanner;
public class Solution {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
for (String s : str.split("\\s+")) {
System.out.print(s.charAt(0));
}
}
} 
