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 Pascal (FPC 3.0.4) (judge verdict: Wrong Answer)

program main;
var
    i : integer;
    ans : boolean;
    s : string;
begin
    readln(s);

    ans := true;
    for i := 1 to length(s) do 
        if (s[i] <> '7') then
            ans := false;

    if (ans) then
        writeln('Yes')
    else 
        writeln('No');
end.