Problem:
Score : 100 points

Problem Statement

You are given a string S of length 3 consisting of a, b and c. Determine if S can be obtained by permuting abc.

Constraints

|S|=3

S consists of a, b and c.

Input

Input is given from Standard Input in the following format:

S

Output

If S can be obtained by permuting abc, print Yes; otherwise, print No.

Sample Input 1

bac

Sample Output 1

Yes

Swapping the first and second characters in bac results in abc.

Sample Input 2

bab

Sample Output 2

No

Sample Input 3

abc

Sample Output 3

Yes

Sample Input 4

aaa

Sample Output 4

No

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
class Program
    {
        static void Main(string[] args)
        {
            String S = Console.ReadLine();
            String[] resultset = { "Yes", "No" };

            bool[] charchecker = new bool[3];
            bool clearflag = true;
            
            // 3個の文字が出てくればいい
            for (int i = 0; i < S.Length; i++)
            {
                if(S[i] == 'a' && !charchecker[0])
                {
                    charchecker[0] = true;
                }
                else if(S[i] == 'b' && !charchecker[1])
                {
                    charchecker[1] = true;
                }
                else if (S[i] == 'c' && !charchecker[2])
                {
                    charchecker[2] = true;
                }
                else
                {
                    clearflag = false;
                    break;
                }
            }
            String result = clearflag ? resultset[0] : resultset[1];
            Console.WriteLine(result);
            //Console.ReadLine();
        }
    }