Problem:
Score : 100 points

Problem Statement

Given is a three-digit integer N. Does N contain the digit 7?

If so, print Yes; otherwise, print No.

Constraints

100 \leq N \leq 999

Input

Input is given from Standard Input in the following format:

N

Output

If N contains the digit 7, print Yes; otherwise, print No.

Sample Input 1

117

Sample Output 1

Yes

117 contains 7 as its last digit.

Sample Input 2

123

Sample Output 2

No

123 does not contain the digit 7.

Sample Input 3

777

Sample Output 3

Yes

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
class Program
{
    static void Main(string[] args)
    {
        bool isyes = false;
        string str = Console.ReadLine();//2つ以上のスペース区切り入力の取得
        foreach (char a in str)
        {
            int s = int.Parse(a.ToString());
            if (s == 7)
            {
                isyes = true;

            }
        }
        if (isyes)
        {

            Console.Write("Yes");//改行なし出力
        }
        else
        {

            Console.Write("No");//改行なし出力
        }
    }
}