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 Common Lisp (SBCL 2.0.3) (judge verdict: Accepted)

(defun has777p (str)
 (< 0 (loop :as c :across str
               :as c7 :across "777"
        :when (eq c7 c)
        :count 1)))

(let ((str (read-line)))
  (princ (if (has777p str)
             "Yes"
             "No")))