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 OCaml (4.10.0) (judge verdict: Accepted)

open Batteries
(* 文字列をcharのlistにする *)
let explode s = List.init (String.length s) (String.get s)
let n = read_line() |> explode
let _ = (if List.mem '7' n then "Yes" else "No") |> print_endline