题解 | #找出字符串中第一个只出现一次的字符#

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while (in.hasNextLine()) {
String s = in.nextLine();
for (int i = 0; i < s.length(); i++) {
if (s.indexOf(s.charAt(i)) == s.lastIndexOf(s.charAt(i))) {
System.out.println(s.charAt(i));
break;
}
if(i==s.length()-1){
System.out.println("-1");
}
}
}
}
}