题解 | #找出字符串中第一个只出现一次的字符#

using System;
using System.Linq;

namespace HJ59
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string inputStr = Console.ReadLine();
            foreach (char c in inputStr)
            {
                int charCount = inputStr.Count(x => x == c);
                if (charCount == 1)
                {
                    Console.WriteLine(c);
                    return;
                }
            }
            Console.WriteLine(-1);
        }
    }
}