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: Wrong Answer)

let s = read_line ();;
let a = 
	if s.[0] == '7' then 1 else 0;;
let b = 
	if s.[1] == '7' then 1 else 0;;
let c = 
	if s.[2] == '7' then 1 else 0;;
print_int (a+b+c)